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Firefox displaying fonts and some formatting incorrectly

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I didn't change or adjust anything, but when I opened Firefox this morning some websites are displaying differently. On some websites, the font size is smaller than 'normal' (see attached Wikipedia screenshots), some font styles have been changed (see attached Serebii and Archive of Our Own screenshots), and some websites are not displaying properly (see attached tumblr screenshots). I have cleared my cookies, cleared my browsing history, reset my browsing and font preferences, disabled all of my add-ons,disconnected from my VPN, logged out and back into Firefox, restarted my computer, and uninstalled and reinstalled Firefox, but the issue still persists.

I'm aware I can custom adjust the font size, which solves the sizing issue, but not the display or changed font.

I've included screenshots of the issues, as well as Chrome screenshots for comparison.

Is there anything else I can do to fix this? Thank you for the help!!

I didn't change or adjust anything, but when I opened Firefox this morning some websites are displaying differently. On some websites, the font size is smaller than 'normal' (see attached Wikipedia screenshots), some font styles have been changed (see attached Serebii and Archive of Our Own screenshots), and some websites are not displaying properly (see attached tumblr screenshots). I have cleared my cookies, cleared my browsing history, reset my browsing and font preferences, disabled all of my add-ons,disconnected from my VPN, logged out and back into Firefox, restarted my computer, and uninstalled and reinstalled Firefox, but the issue still persists. I'm aware I can custom adjust the font size, which solves the sizing issue, but not the display or changed font. I've included screenshots of the issues, as well as Chrome screenshots for comparison. Is there anything else I can do to fix this? Thank you for the help!!
Attached screenshots

Chosen solution

Did this just start today?

Thank you for sharing your Add-ons list -- I think the problem is in the Facebook Container extension. Version 2.3.3 had a bad style sheet so they quickly released version 2.3.4 to resolve this. Firefox should find it on a routine check, but to speed that up:

Open the Add-ons page. Either:

  • Ctrl+Shift+a (Mac: Command+Shift+a)
  • "3-bar" menu button (or Tools menu) > Add-ons
  • type or paste about:addons in the address bar and press Enter/Return

In the right side, below the search box, there is a gear/wheel icon. Click that icon to drop the menu and then click "Check for Updates" to trigger an update.

Alternately, click Facebook Container to show its Details panel, scroll down below the description, and click "Check for Updates".

Does that work for you?

Ref. https://support.mozilla.org/questions/1388720

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Seçilmiş Həll

Did this just start today?

Thank you for sharing your Add-ons list -- I think the problem is in the Facebook Container extension. Version 2.3.3 had a bad style sheet so they quickly released version 2.3.4 to resolve this. Firefox should find it on a routine check, but to speed that up:

Open the Add-ons page. Either:

  • Ctrl+Shift+a (Mac: Command+Shift+a)
  • "3-bar" menu button (or Tools menu) > Add-ons
  • type or paste about:addons in the address bar and press Enter/Return

In the right side, below the search box, there is a gear/wheel icon. Click that icon to drop the menu and then click "Check for Updates" to trigger an update.

Alternately, click Facebook Container to show its Details panel, scroll down below the description, and click "Check for Updates".

Does that work for you?

Ref. https://support.mozilla.org/questions/1388720

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Updating Facebook Container did solve my problem, thank you so much for the quick reply!