Recently made the switch to Mint from Windows. I am having a problem with FF though. Randomly but very frequently I see your most basic page load very slow if not at all. I have disabled hardware acceleration as some research has suggested but it still has the same issue. This happens on both my laptop and desktop.
A first good ideas is always to create a second seperate profile (for example via
about:profiles
) and see if your issue can be reproduced with a fresh one without any modifications. The result will give a solid hint if your problem is profile or browser/system related.