Forum d’assistance Firefox

I haven't been able to update Firefox (Mac, desktop) since version 82 because all updates use a font I can't read. Websites are displayed correctly, but bookmarks, most Firefox preferences (including about:config), tab headings and search imputs are as shown in the screenshots.

Today I downloaded version 90 and it's still happening. Please see the screenshots of the Firefox welcome screen, and the font selections in the preferences. The version for the screenshots is a new, clean download using default settings, with no addons or bookmarks.

I don't know if the font is a real language or not.

I use portableapps FF on windows 10. I just updated to 89 from 82 and now all my menus in the toolbar (i.e. my bookmarks as folders) now are much longer due to extra space between each item. Where I didn't have to scroll before I do now.

How can I change it back to what it was before so the pulldown menus I've tailored with no scrolling required will again work as before.

I have gone back to 82 because of this.