Development Build
Below are development builds for testing purposes.
Latest development build: 2.5.4.25 (October 22nd 2025)
Latest stable release build: 2.5.4.0
https://github.com/clsid2/mpc-hc/releases/tag/2.5.4
Below are development builds for testing purposes.
Latest development build: 2.5.4.25 (October 22nd 2025)
Latest stable release build: 2.5.4.0
https://github.com/clsid2/mpc-hc/releases/tag/2.5.4
Donations are appreciated. There is now a PayPal option.
Updates:
Fixes:
Subtitle downloads from OpenSubtitles may fail depending on time of day. This is due to our daily download quota being exceeded. Current amount of donations is barely enough to pay for the existing quota. So it is unlikely that quota can be increased and situation will get worse over time.
If you create an OpenSubtitles account and configure it in MPC-HC settings then you may be able to bypass the quota.
Options > Subtitles > Misc > Right-click on OpenSubtitles.com > Setup > Fill in username/password
If you want to create you own toolbar design, read this.
You can help improve and complete translations. See this topic for more info. There are several languages where recently added options have not yet been translated.
A lot of people seem to be unaware of some of the awesome features that have been added to MPC-HC in the past years. Here is a list of useful options and features that everyone should know about:
Adjusted the timing of the new drag-to-pin interaction cue for better reliability. (Bug 1989344)
Fixed an issue that prevented some extensions from updating via the Add-ons Manager. (Bug 1984724)
Fixed a regression that prevented Firefox View sections from collapsing/expanding as expected. (Bug 1989200)
Addressed a WebExtensions storage issue that could cause Firefox to crash on startup with certain extensions installed. (Bug 1989840)
Fixed an issue where opening an add-on's "Extension settings" from the post-install prompt could break the Customize tab and some keyboard shortcuts until restart. (Bug 1983869)
Reduced long delays when loading certain websites while connected to networks that block UDP connections. (Bug 1980812)
Various stability and security fixes.
Reference link to 143.0.1 release notes.

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Fixed a tab crash experienced by some users caused by DLL injection. (Bug 1872261)
Reference link to 143.0 release notes.

Updates:
Fixes:
Updates:
Additions/improvements:
Fixes:
On Windows, Firefox now supports running websites as web apps pinned directly to the taskbar. These are sites that you can pin and run as simplified windows directly from the taskbar without losing access to your installed add-ons. This feature is not currently available for Firefox installs from the Microsoft Store.
Tabs can now be pinned by dragging them to the start of the tab strip, making it easier to keep important sites within reach.
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Copilot from Microsoft can now be chosen as a chatbot to use in the sidebar for quick access without leaving your main view.
When a site asks for camera access, it can now be previewed inside the permission dialog. This is especially helpful when switching between multiple cameras.
![]()
The Firefox address bar can now show you important dates and events. This feature supports displaying events (e.g. βMotherβs Dayβ) in the United States, United Kingdom, Germany, France, and Italy regions.
Firefox has expanded its Fingerprinting Protection by reporting constant values for several more attributes of user's computers.
When downloading a file in Private Browsing mode, Firefox now asks whether to keep or delete it after that session ends. You can adjust this behavior in Settings.
![]()
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Firefox now supports Windows UI Automation, which improves support for accessibility tools such as Windows Voice Access, Text Cursor Indicator and Narrator.
This feature is part of a progressive roll out.
Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.
Various security fixes.
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 143 Release Notes.
Unchecking the Group Similar Messages setting now prevents successive similar messages from being grouped so that all messages are displayed in the output.
Switching between unmodified and pretty printed sources in the debugger no longer opens a new tab for pretty printed content.
When the Inspector is focused, the eyedropper can now be launched to pick a color via the Ctrl+Shift+Y keyboard shortcut.
Firefox now supports xHE-AAC audio playback on Windows 11 22H2+, macOS, and Android 9+.
Firefox now uses an updated grid sizing algorithm to better align with the CSS Grid specification. Grid layouts that use percentage row sizes or grid items containing elements with aspect ratios (such as images) will now render correctly in more cases.
<input type=color> now recognizes the CSS <color> format in addition to the color hex format (#ffffff). This means that color names like black and more complex strings like rgb(200 200 200) are now valid inputs. For now the value will always be converted to the hex format.
Restrictions were removed that prevented setting the display property on <details> elements, and a ::details-content pseudo-element was added to style the expandable/collapsible contents of those elements.
With the release of Firefox 143, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 12 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:

OBS-Studio-32.0.0-beta2-Sources.tar.gz: defe8b0602aaab56098611f914751287da34dc12788ce5a3eb1f02142712015a
OBS-Studio-32.0.0-beta2-Ubuntu-24.04-x86_64-dbsym.ddeb: 8141bb6a0be086a62f7feb681ecd50597b668fa41df1745946a58f5144142d4d
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OBS-Studio-32.0.0-beta2-Windows-arm64-PDBs.zip: 3351f40a0379793c4f69ce6f5616791b4cd2ad16fdcbbbe559611148d8601514
OBS-Studio-32.0.0-beta2-Windows-arm64.zip: a8b14d84a50737116f4c20e6635151d8277bc34d73b36c50543b4a777d09779c
OBS-Studio-32.0.0-beta2-Windows-x64-Installer.exe: a31d2f2656fcfab0f7eba4f9f5b60b65a079cee447b4fd0187a69b4789652763
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OBS-Studio-32.0.0-beta2-macOS-Apple-dSYMs.tar.xz: 6bcc4b35ea4003bfe544030c3756d3a61d1bcafed9bbeef8da539f8c72c85c33
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Dragging multiple non-adjacent tabs in horizontal tab strip mode now correctly moves them together as a group. (Bug 1982933)
Dragging multiple tabs no longer causes toolbar unresponsiveness or visual glitches. (Bug 1984342)
Fixed an issue where the text cursor appeared in the wrong location.. (Bug 1984045)
Fixed a crash related to gamepad use, particularly on macOS. (Bug 1870379)
Fixed an issue where the expand on hover feature in the sidebar would sometimes stop working. (Bug 1982129)
Fixed a crash in KDE Plasma when using certain custom window decorations. (Bug 1984823)
Reference link to 142.0 release notes.

For users in the United States, article recommendations on your New Tab page are now grouped into topic sections like Sports, Food, and Entertainment to make stories more organized and easier to scan. You can also follow topics youβre interested in and block ones youβd prefer not to see, giving you more control over what shows up when you open a new tab.
This feature is part of a progressive roll out.
Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.
You can now see whatβs behind a link before visiting it with Link Previews. Long press a link (or right-click and choose Preview Link). Previews can optionally include AI-generated key points, which are processed on your device to protect your privacy.
Link Previews is gradually rolling out to ensure performance and quality and is now available in en-US, en-CA, en-GB, en-AU for users with more than 3 GB of available RAM.
This feature is part of a progressive roll out.
Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.
On Windows, clicking a persistent notification when Firefox is closed or restarted will now properly open Firefox with the relevant webpage, instead of just opening the main page of the website.
ETP Strict mode now supports a flexible exception list to fix broken site features caused by tracker blocking. Exceptions are split into baseline (core functionality) and convenience (extra features), letting users choose improved site compatibility without compromising key privacy protections.
Keep an active tab visible in a collapsed tab group
Focus on just one tab in a group without the clutter. Your active tab stays in view, keeping things tidy even with the group collapsed.
You can now remove extensions from the sidebar by right-clicking the extension icon and selecting Remove from Sidebar.
Improved the scroll speed in the bookmarks dialog to not go beyond the component area.
Improved drag-and-drop support for blob images.
Various security fixes.
Improved search results from browsing history via the address bar, reducing the likelihood of duplicate results being shown.
Improved Netmonitor so that Request Headers/Cookies/Params are displayed in the Network panel even if the request isn't finished yet.
You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 142 Release Notes.
Firefox now supports the wllama API for extensions, enabling developers to integrate local language model (LLM) capabilities directly into their add-ons.
The Debugger now offers a new setting to control whether the debugger overlay is shown during paused script execution.
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Firefox now supports the Prioritized Task Scheduling API, enabling developers to assign and manage task priorities.
The Selection.getComposedRanges() API is now available, allowing developers to accurately get selected text ranges across shadow DOM boundaries.
Added support for the URLPattern API, enabling developers to match and parse URLs using a standardized pattern syntax.
Multiselecting non-contiguous tabs to drag may result in toolbar unresponsiveness or visual glitches. Dragging any single tab should resolve this. We will be landing a fix in the next dot release with Bug 1984342.
With the release of Firefox 142, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 20 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:

SHA-256
4ffabce468b03d6357ce5f4594e209714d1509d065da102938096dad6654c36e ventoy-1.1.07-linux.tar.gz
737c681af3549ebfb2234abe8dc4a2968a7b29548105b619b04cf9302b897557 ventoy-1.1.07-livecd.iso
3e7a8db199c7e791e341e6d388d078bfc6b7a77c6f10282edf9c7b82f84f3ad4 ventoy-1.1.07-windows.zip
Wana boot and install OS through network (PXE)? Welcome to my new project iVentoy.
About iVentoy https://www.iventoy.com
iVentoy is an enhanced version of the PXE server.
Extremely easy to use
Many advanced features
x86 Legacy BIOS, IA32 UEFI, x86_64 UEFI and ARM64 UEFI mode supported
110+ common types of OS supported (Windows/WinPE/Linux/VMware)
......
SHA-256
6176cc1ea7c8b822f5ee11fa5c3c71331aa194c72167a35196d8f1380b2feb17 ventoy-1.1.06-linux.tar.gz
681f8ac9fecdfafeeedce8f55b8758c22a93f76be0284c01a78689ae9f60527f ventoy-1.1.06-livecd.iso
ce192b6c3bb144f3f5e850b1df3e90457503badcc959581eaa46be9fcc9fa8e6 ventoy-1.1.06-windows.zip
Below are development builds for testing purposes.
Latest development build: 2.5.2.37 (September 15th 2025)
This version has new options to customize the toolbar buttons.
If you want to create your own toolbar design read this.
Latest stable release build: 2.5.2.0
https://github.com/clsid2/mpc-hc/releases/tag/2.5.2
Now Firefox can help you keep your tabs organized, automatically. A local AI model identifies similar tabs, automatically organizes them into groups, and even suggests group names. Everything happens on your device to respect your privacy. Learn more here.
![]()
This feature is part of a progressive roll out.
Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.
Vertical tabs users can now adjust the size of the tools areas at the bottom of the sidebar. To see fewer tools and more tabs, drag down the divider line which pushes extra tools into an overflow menu.
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On Linux, Firefox uses less memory and no longer requires a forced restart after an update has been applied by a package manager.
Address autofill has been enabled for users in Brazil, Spain and Japan.
The Firefox address bar can now be used as a unit converter. The unit converter supports converting units of length, temperature, mass, force, and angular measurement, as well as timezones (e.g. βnow in GMTβ , β10am EDT to CETβ). Selecting the result will copy it to your clipboard. Learn more here.
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Firefox builds in Valencian now come with a built-in Catalan (Valencian variant) dictionary for the Firefox spellchecker.
The following languages are now available for translation:
Various security fixes.
Firefox on Windows 11 now uses system provided font icons for the caption buttons, more in line with Windows 11 conventions.
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 141 Release Notes.
Firefox will now also clear the back-forward-cache when receiving the Clear-Site-Data: "cache" response header.
When creating a logpoint in the Debugger, there's now a checkbox allowing to output the stacktrace in addition to the log message in the Console.
Enabled the WebGPU API (spec; MDN) on Windows. For details, see the Mozilla Graphics Team Blog.
Support for Cookies Having Independent Partitioned State (CHIPS) is now re-enabled, allowing developers to opt a cookie into storage partitioning per top-level site.
The HTMLElement.showPopover() and HTMLElement.togglePopover() methods now take an options.source argument referencing the popover invoker, and togglePopover() also takes a force resp. options.force argument to force the popover open or closed.
With the release of Firefox 141, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 12 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:

Fixed a startup crash experienced by some Linux users with outdated NVIDIA drivers. (Bug 1978911)
Fixed a regression that caused canvas objects to be draggable, causing web compatibility issues. (Bug 1978673)
Fixed a crash in the Web Developer Tools panel that could occur when inspecting pages with <iframe> elements. (Bug 1975277)
Fixed minor visual issues across the user interface. (Bug 1974269 Β· Bug 1976031 Β· Bug 1974876 Β· Bug 1976701)
Firefox wouldn't start on some systems where GTK+ was built without Wayland support. (Bug 1978620)
Fixed an issue where clicking a pinned tab could steal focus from the content area, disrupting keyboard navigation. (Bug 1977005)
Reference link to 141.0 release notes.

Fixed a regression that caused issues on sites built with the Svelte framework. (Bug 1980081)
Fixed an issue where cryptominers were not listed as blocked in Strict Tracking Protection. (Bug 1977066)
Reference link to 141.0.2 release notes.

Fixed a regression that caused issues on sites built with the Svelte framework. (Bug 1980081)
Fixed an issue where cryptominers were not listed as blocked in Strict Tracking Protection. (Bug 1977066)
Reference link to 141.0.2 release notes.

Fixed a startup crash experienced by some Linux users with outdated NVIDIA drivers. (Bug 1978911)
Fixed a regression that caused canvas objects to be draggable, causing web compatibility issues. (Bug 1978673)
Fixed a crash in the Web Developer Tools panel that could occur when inspecting pages with <iframe> elements. (Bug 1975277)
Fixed minor visual issues across the user interface. (Bug 1974269 Β· Bug 1976031 Β· Bug 1974876 Β· Bug 1976701)
Firefox wouldn't start on some systems where GTK+ was built without Wayland support. (Bug 1978620)
Fixed an issue where clicking a pinned tab could steal focus from the content area, disrupting keyboard navigation. (Bug 1977005)
Reference link to 141.0 release notes.

This is a maintenance release that adds a Bulgarian translation and fixes some important bugs.
There are two releases of Paint.NET:
Changes since 5.1.8:

Below are development builds for testing purposes.
Latest development build: 2.5.1.19 (August 5th 2025)
Please report if you notice any freezing issues with the latest development build.
Latest stable release build: 2.5.1.0
https://github.com/clsid2/mpc-hc/releases/tag/2.5.1