I've never had this particular problem with the fonts, so I could guess you've selected a font that has only a bold vision to be your default font. Troubleshooting mode ususally removes all user settings, fonts included, that's why the font appears OK in that mode. Which is why I think you've simply chosen the wrong font. I have solved the fonts problems on my FF like this: • chosen default font is Open Sans. • installed extension: https://addons.mozilla.org/en-US/firefox/addon/enforce-browser-fonts/ When the page vision looks broken, I click the icon of the extension and it switches to fonts from the page. Such a broken view is with Google Translate. This extension works on a site by site basis.

I've never had this particular problem with the fonts, so I could guess you've selected a font that has only a bold vision to be your default font. Troubleshooting mode ususally removes all user settings, fonts included, that's why the font appears OK in that mode. Which is why I think you've simply chosen the wrong font. I have solved the fonts problems on my FF like this: • chosen default font is Open Sans. • installed extension: https://addons.mozilla.org/en-US/firefox/addon/enforce-browser-fonts/ When the page vision looks broken, I click the icon of the extension and it switches to fonts from the page. Such a broken view is with Google Translate. This extension works on a site by site basis.

Its not that, i haven't messed with the default fonts at all, they're all set to the ones firefox starts with. I did double check in case i had accidentally clicked something in there but its all normal. Fwiw, i'm calling this error 'bold' font but i cant tell if its showing it as, ie, actually a regular font with a bold effect turned on, or a font like Impact or similar that has that very heavy always-bold look.

[v56+] Type about:preferences#general<enter> in the address bar. Under fonts and colors, press the Advanced button. Scroll to the bottom, turn on Allow Web Sites To Choose Their Own.

Make sure you haven't enabled a High Contrast theme in the OS settings.

We have seen reports that this can be caused by a problem with fonts like Roboto or Helvetica that you have installed locally and that might be corrupted or are missing some variants. Also, make sure you allow pages to choose their own fonts and that you do not block remote (downloadable) fonts.

• /questions/1325619 Weird font on some website's

[v56+] Type about:preferences#general<enter> in the address bar. Under fonts and colors, press the Advanced button. Scroll to the bottom, turn on Allow Web Sites To Choose Their Own. Make sure you haven't enabled a High Contrast theme in the OS settings. We have seen reports that this can be caused by a problem with fonts like Roboto or Helvetica that you have installed locally and that might be corrupted or are missing some variants. Also, make sure you allow pages to choose their own fonts and that you do not block remote (downloadable) fonts.

• /questions/1325619 Weird font on some website's

The 'Allow Web Sites To Choose Their Own. ' was already on by default, i mentioned in the original post that turning it OFF fixed this but then had the problem with icons. The conflicting local font file thing seems to have done it though, i uninstalled helvetica and the page looks normal now, thank you!

Glad to help. Safe Surfing.