This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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.

Firefox 91.0 -- Not rendering websites correctly after update

Dave Wolf
Dave Wolf
more options

After the automatic upgrade to version 91.0, a variety of websites such as GMail, YouTube, MarketWatch are being displayed in a very rudimentary manner (see screen shots). I've refreshed, as well as reinstalled my Firefox instance and there was no change to the websites' display. Viewing the websites on Safari or Chrome yields correctly displayed sites.

After the automatic upgrade to version 91.0, a variety of websites such as GMail, YouTube, MarketWatch are being displayed in a very rudimentary manner (see screen shots). I've refreshed, as well as reinstalled my Firefox instance and there was no change to the websites' display. Viewing the websites on Safari or Chrome yields correctly displayed sites.
Attached screenshots

All Replies (2)

Shashank Shekhar
Shashank Shekhar
more options

TYPED BY MISTAKE

Modified by Shashank Shekhar

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Hi Dave, I might be duplicating what Shashank Shekhar is typing, but just in case:

Firefox 91 now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS. (release notes).

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?