Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Webpage display problem with v91 for Mac

  • 3 replies
  • 4 have this problem
  • 1 view
  • Last reply by Mark

taiwanho
taiwanho
more options

I've been using Firefox for years but I am stuck with this problem. Firefox just updated to version 91.0 (64-bit) and now webpages are not being rendered correctly as per the attached screenshot. It seems to be a selective CSS issue and it is across all pages.

I have tried restarting the computer, clearing the cache, and changing the theme. This is happening on two different Macs both running macOS v 11.4.

The first image shows the page in Firefox, and the second in Safari (and how it used to look in Firefox before version 91).

Does anyone have any idea why this is happening?

I've been using Firefox for years but I am stuck with this problem. Firefox just updated to version 91.0 (64-bit) and now webpages are not being rendered correctly as per the attached screenshot. It seems to be a selective CSS issue and it is across all pages. I have tried restarting the computer, clearing the cache, and changing the theme. This is happening on two different Macs both running macOS v 11.4. The first image shows the page in Firefox, and the second in Safari (and how it used to look in Firefox before version 91). Does anyone have any idea why this is happening?
Attached screenshots

Chosen solution

I just realised that this is because Firefox is automatically using high contrast mode when "Increase contrast" is set in the macOS system preferences, and that this can be turned off in FF preferences under General -> Colors -> Override the colors specified by the page with your selections above -> Never

Read this answer in context 👍 4

All Replies (3)

taiwanho
taiwanho Question owner
more options

Chosen Solution

I just realised that this is because Firefox is automatically using high contrast mode when "Increase contrast" is set in the macOS system preferences, and that this can be turned off in FF preferences under General -> Colors -> Override the colors specified by the page with your selections above -> Never

Remco
Remco
more options

I had to stop using FF yesterday because some webpages were rendered in a strange way and unusable. This trick solved the problem for me, thank you very much!

Mark
Mark
more options

This is not the only problem.

I have other sites where the CSS is just not recognised. I have now stuck to v90

First I do want the high contrast so turning Firefoxs option off is not a usable option

I use Tree tab Style for tabs and Stylus for altering CSS. Even with the firefox flag not set the tabs are all white and the CSS override does not work.

Can we please revert the code to a working version