Firefox Community Forum

Firefox quite often will remove, replace, add, or layer text as I use it. It has been doing this since I first downloaded it, and I haven't had it for long. (I will say that it isn't the first program I've seen do this. the only other program I've seen do this is Zotero.) I'm not doing anything weird with it, it just happens as I use it. Some of the screenshots I've submitted are of what I'm literally typing right now.

I've tried using troubleshoot mode, but it works just fine when I'm using troubleshoot mode, so I can't appropriately use that mode.

This has been an issue that I've been having for the past month and have been unable to find a proper fix to it.

While Firefox opens normally, none of the previous windows show up on screen. Even though I can still technically interact such as opening new tabs in it and click through tabs with Firefox View. Once I try to pull them up none of them show on the monitor nor can be interacted with further. I have both uninstall and reinstall Firefox and deleted/rename the xulstore.json, but neither of them fix the problem The only temporary solution I've found is through refreshing Firefox through about:support, even then it only takes a couple days to suddenly have the problem come back all over again.

For added info I'm using a 2019 iMac with 15.2 OS.

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.

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