Firefox Community Forum

I successfully built Firefox v135 from source for the RISC-V architecture and created a .deb package. After installing the package, Firefox launches correctly, but performance is significantly degraded—especially during video playback, where it becomes very laggy.

Upon inspecting about:support, I noticed that under the "Compositing" section, it shows WebRender (software), and CPU usage is extremely high. Additionally, WebGL 1 and WebGL 2 are not available, despite the presence of a dedicated GPU Hardware and its driver.

During the build process, Firefox required LLVM v14 as a dependency. It appears that this setup defaults to using LLVMpipe, which results in software rendering and prevents the OpenGLES driver from being utilized, leading to the fallback to software WebRender.

In contrast, I tested another .deb package of Firefox built specifically for the VisionFive2 (JH7110) board. In that case, the "Compositing" section correctly shows WebRender (without the "software" tag), and both WebGL 1 and WebGL 2 are available, indicating proper GPU Hardware acceleration.

Could anyone guide me on how to enable hardware-accelerated WebRender and ensure that Firefox uses the GPU instead of falling back to software rendering?

Please find the "about:support" page in the attached Troubleshooting Information.xhtml file. Kindly do let us know if there's any further information needed.

Thanks in advance, Saiteja

Sometimes, when another application displays a window in the same display area as the Firefox browser window, Firefox will reassert itself as the front-most focused window. I can try clicking on the other app in the dock, or use Exposé to re-select the other app, but Firefox will just reassert itself again. I have to minimize Firefox in order to interact with the other app that's being covered.

Firefox is not in full-screen mode, just in regular window mode.

Dear Mozilla Support Team,

I hope you're doing well. I'm writing to request a feature enhancement for Mozilla Firefox that would greatly improve the user experience, especially on lower-end or older hardware.

Currently, whenever I open Firefox after closing it, it takes about 2–3 seconds to launch. In comparison, Microsoft Edge opens almost instantly due to features like Startup Boost and background mode, which allow it to keep essential processes running even when the main window is closed.

I would love to see similar functionality in Firefox — such as:

An optional "Startup Boost" feature to keep Firefox running in the background for faster launching.

A tray icon mode that allows Firefox to stay running in the system tray instead of closing completely.

A setting to allow background updates or session prep on startup/login.

These additions would make Firefox even more competitive in terms of performance and convenience.

Thank you for your continuous efforts in maintaining a privacy-respecting and open-source browser. I truly appreciate your work.

Best regards, RIYYAN AMIR

Please tell me why this happens daily. I cannot access my laptop after a break at 10:00 am..... for some reason, Firefox freezes, only thing that will work is the Chrome browser.

As the title says -- I can no longer save images or download files without Firefox locking up. Whenever I do, the window grays out, the cursor's "busy" animation starts up, any videos playing in Firefox at the time grind to a halt, and I have no choice but to close Firefox when the "This program is awaiting a response from you" error message pops up. Whatever I'm trying to save will get saved to my computer, but Firefox always freezes up.

I've tried updating Firefox, resetting Firefox, restarting my computer, clearing my download history, changing the download folder, running troubleshooting mode and a private window. I even tried downgrading from 137.0.2 (64-bit) to version 136.0 out of desperation, and even that didn't solve it. I'm running Windows 11 Home, and this problem has only started happening in the last few weeks.

Any help would be greatly appreciated!

Respected Sir/Madam, I found a problem to use Mozilla Firefox (137.0.2 (64-bit)) on Windows 10, problem shows in attachment.

Already uninstall Firefox and reinstall it but problem not solved. After restart PC Firefox works and it browsing speed is very very slow but after close Firefox problem start again.

Please give me the solution. I am a die hard lover of Mozilla Firefox.

Win 11, latest FF version. A few addons, that never cause problems.

Firefox keeps freezing. I've checked Task Mgr, Event Viewer, Troubleshooting - and cannot find out why this is happening.

Restarted 3 times, but when I open outlook.com, the mail freezes. Open tabs keep freezing, so I'm unsure the culprit.

After the last Mozilla update (138.0.1) the browser is now slow to load pages. You type in the website address or click on the bookmark and it takes minutes before the website begins to load. If you click on open link in new tab Mozilla freezes and if you wait it out 9 to 10 minutes later Mozilla comes good again and will open the link in new tab. No issues occurring before the 138.0.1 update. How can I roll back to the prior release?

I'm currently using MacOS 15.4.1 Sequoia with FireFox 138.0.1. It works fine after updating from 138.0.0 on my primary (Administrator) account. However, there is a second User account on this MacBook Pro laptop, used by other family members. All is not well here... Firefox updated itself from 137.0.0 recently and now will not run on the User account. On startup, it asks for an Administrator password to install a Helper tool and then will proceed no further. I have tried :-

Making the User account into Administrator - still hangs Cancel and re-start FireFox - hangs! Re-start the MacBook from cold - hangs! Cleaned Firefox installation and folders in the User Library (both User and Administrator) - still hangs! I'm aware there are two Library folders, one each for the System and one for each user, didn't touch the System Library. Added a new User account - it works! So maybe something in the System Library is the culprit? I've always regarded that area as "off limits" to us mere mortals, so please, not the "Wipe it and Start Again" option.

I don't really want to kill the User account, there is a lot of data in there and surely will miss something important if I delete it.

Summary, 137.0.0 worked, it updated to 138.0.1, it hangs up! I am unable to fix it. Any offers guys?

Hi there, I have this issue when I move tabs in scrolling tab bar. I can't move tabs smoothly, I have to keep moving up and down with the tab till the end. This issue is with multiple Linux systems.