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after v91 update, background and styling don't render properly

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  • Last reply by matt136

matt136
matt136
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After the v91 update, all websites look different. Stylesheets are loading, but background images do not. Buttons are not styled. Text is always black. Links are always blue. It's like the website's own CSS is selectively ignored in favor of some sort of bland default.

None of the following have fixed the issue: 1- View Menu > Page Style is set to Basic Page Style. I've flipped this to No Style and back. CSS is rendering, just not correctly.

2- I restarted FF in safe mode (option-click to launch).

3- I trashed the prefs.js file.

4- The problem still exists in Troubleshooting mode.

5- I cleared the cache.

6- I switched to the Dark theme.

7- I removed all extensions and add-ons (other than whatever comes with the browser).

8- I reinstalled v91 from a fresh download.

This problem breaks FF internals; e.g. see the screenshot of the About:config page, where a popup is transparent because (presumably) its background isn't rendering.

After the v91 update, all websites look different. Stylesheets are loading, but background images do not. Buttons are not styled. Text is always black. Links are always blue. It's like the website's own CSS is selectively ignored in favor of some sort of bland default. None of the following have fixed the issue: 1- View Menu > Page Style is set to Basic Page Style. I've flipped this to No Style and back. CSS is rendering, just not correctly. 2- I restarted FF in safe mode (option-click to launch). 3- I trashed the prefs.js file. 4- The problem still exists in Troubleshooting mode. 5- I cleared the cache. 6- I switched to the Dark theme. 7- I removed all extensions and add-ons (other than whatever comes with the browser). 8- I reinstalled v91 from a fresh download. This problem breaks FF internals; e.g. see the screenshot of the About:config page, where a popup is transparent because (presumably) its background isn't rendering.
Attached screenshots

Chosen solution

Hi Matt, it looks like you are running Firefox on MacOS.

As mentioned in the release notes, "Firefox [91] now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS."

Is it possible you have that setting?

If so, please try one or both of these two options:

(1) Turn off the system-level setting. This appears to be the most effective workaround.

(2) Disable High Contrast mode in Firefox. See: Disable high contrast mode in Firefox.

For both changes, you might need to Quit Firefox and start it up again to see the normal display.

Any difference?

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
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Chosen Solution

Hi Matt, it looks like you are running Firefox on MacOS.

As mentioned in the release notes, "Firefox [91] now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS."

Is it possible you have that setting?

If so, please try one or both of these two options:

(1) Turn off the system-level setting. This appears to be the most effective workaround.

(2) Disable High Contrast mode in Firefox. See: Disable high contrast mode in Firefox.

For both changes, you might need to Quit Firefox and start it up again to see the normal display.

Any difference?

matt136
matt136 Question owner
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Jefferson, thank you! Disabling the system setting indeed fixes the problem.