I-Firefox Isithangami Sokwesekwa

Attached is a sample of how web pages display. These can either initially display this way or, as in this example, the page opened correctly, I stepped away for a few minutes and when I viewed the page again it looked like the example. I can have a page open and it is displaying correctly, then open a new tab and go to a different site and the text will look like the example.

I have cleared the cache, dumped all the cookies. Restarting the browser (I do this many times a day) will fix the current page but eventually another page will display like this.

I running version 84.0.2 64bit on a Mac Pro Mojave. I don't have this problem with other browsers like Chrome or Safari. I never see it on my Windows 10 system.

Firefox updated to version 89 last night and since then I cannot properly view certain websites I use regularly such as BBC news and Vimeo (have uploaded pic to show). I have restarted computer, and turned off hardware acceleration and cleared cache and cookies - these don't help. If I start in safe mode it's all fine - I've disabled any extensions and themes and tried again but the problem is still there. All was fine before the update. Not sure what to do next.

Some solid colours on certain webpages do not appear whilst on Firefox. The background will show up instead of the colour the image should be. I have tried to delete the cookies and cache on Firefox as well as trying Firefox in troubleshoot mode to no avail. Whilst writing this question, I have also discovered that taking a screenshot of the issue shows how the image should look as opposed to what the screen shows. Attached are some images of the issues I am facing, two images are of what appears on the screen and one image is the screenshot from the webpage which is what should have been shown. Apologies for some of the photos, I had to take a photo of the screen with my phone to show the issue. I have also closed the browser multiple times and restarted my computer, any help would be appreciated. Thanks in advance.

Today, when I opened Firefox web browser and go to a site(s), I get a different appearance to what I am used to and I don't like it. I have downloaded the latest version of Firefox (91.0) but this has not helped. I use Firefox on a Mac. Any suggestions on how to revert to the previous appearance would be appreciated.

Firefox seems to be partially transparent, which makes my background to bleed over the Firefox windows. I have already reinstalled it, cleared cookies and data, refreshed firefox, made a new profile and even deleted all firefox files and cache in ~/.mozilla/firefox and /usr/lib/firefox/ & firefox-addons/.

And despite all of this it still does not seem to fix the transparency issue, apart form it all the browser works great only that visual bug annoys the experience. The errors seems to disappear if Firefox is launched in Troubleshoot Mode but launching without it brings back the issue.

NOTE: It can be fixed by installing a fresh copy of the system which is not convenient. Error happens in Firefox-92.0 in linux.