Firefox Community Forum

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