Why does the text (only in firefox) look like i'm using a PC from the 90's? It worked fine before.

What font is used to display this text? You can right-click and select "Inspect Element" to open the builtin Inspector with this element selected. You can check the font used for selected text in the Font tab in the right pane of the Inspector. *https://developer.mozilla.org/en/Tools/Page_Inspector/How_to/View_fonts ---- You can try to disable hardware acceleration in Firefox. *Options/Preferences -> General: Performance<br>remove checkmark: [ ] "Use recommended performance settings"<br>remove checkmark: [ ] "Use hardware acceleration when available" *https://support.mozilla.org/en-US/kb/performance-settings You need to close and restart Firefox after toggling this setting. *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems You can check if there is an update for your graphics display driver and check for hardware acceleration related issues. *https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration ---- <p>Firefox 52+ has changed from Cairo to Skia for canvas/content rendering.</p> <ul> <li>https://www.mozilla.org/en-US/firefox/52.0/releasenotes/</li> <li>When not using Direct2D on Windows, Skia is used for content rendering</li> </ul> <p>You can modify these gfx.*.azure.backends prefs on the <b>about:config</b> page to revert to the old font rendering swap the skia,cairo order to cairo,skia or remove the skia and leave cairo.</p> <ul> <li>gfx.canvas.azure.backends = direct2d1.1,cairo,skia</li> <li>gfx.content.azure.backends = direct2d1.1,cairo,skia</li> </ul> You can open the <b>about:config</b> page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue. *http://kb.mozillazine.org/about:config