Hi there, could you add which specific websites don't work for you?

Hi, Generally, it's easier to support only one most-used browser engine (Chromium, which powers Chrome, Edge, Opera and others) and not care about other engines (such as Gecko powering Firefox or Blink powering Safari). And, unfortunately, some companies just choose that path. Sometimes, the issue is that some API is not supported in a particular engine, but that's the minority of cases. Anyway, Mozilla founded a project called [https://webcompat.com/ WebCompat] that aims to solve this. It collects info about web compatibility issues (when websites work in some browsers and don't work in others), tracks these issues and attempts to fix them. In Firefox, you can [[How do I report a broken site in Firefox desktop?|report a website]] from the menu > Report Broken Website... but there are also some steps you can try first: # Please check if you have [[Enhanced Tracking Protection in Firefox for desktop|Enhanced Tracking Protection]] (ETP) enabled. You can do that by clicking the shield [[Image:Fx89ShieldIcon]] icon in the left part of the address bar. #* If ETP is enabled, try disabling it. # If the problem is not fixed, try [[How to clear the Firefox cache|clearing Firefox cache]]. # If it does not help, try [[Clear cookies and site data in Firefox|clearing cookies and data]] for the website you experience troubles with (''warning: you will be logged out on this website''). # If it also does not help, try [[Diagnose Firefox issues using Troubleshoot Mode|running Firefox in Troubleshoot Mode]]. If the problem doesn't persist, please follow the steps from [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems | this article]] to troubleshoot further. # If nothing from the above helps, try [[Manage Firefox profiles|creating a new Firefox profile]] and check if the issue persists there. If it doesn't, you can [[Restore bookmarks, passwords and data from an old Firefox profile|start copying files from your old profile to the new one]] to identify which one causes the issue. See [[About your important data and their files|this article]] on what files to copy. I hope the above helps, but please feel free to reach out if you have any additional questions.

''<p>Konstantina Papadea [[#answer-1819629|said]]</p>'' <blockquote>Hi there, could you add which specific websites don't work for you? </blockquote> Oops, Konstantina got here faster :D I'd also be interested to see the specific examples, and you can also try the steps above for them!