[mrec]

I did the same in FF/Win - web fonts were a huge step back in my opinion - but immediately discovered a bunch of sites (including GitHub) abusing web fonts for button images, which made them pretty much unusable. Have you found a selective workaround for this?

[dredmorbius]

With uMatrix you can selectively enable various features for sites. I tend to start with minimal sets and re-enable to the point I've achieved sufficient functionality for my needs.

[coffeedrinker]

I use Chrome and a plugin called Font Changer that lets one override fonts on pages. I don't need to have it turned on for all sites but it can be done. Mostly I just have everything set to Arial (I don't like reading any serif fonts on screen). Perhaps there is a plugin for Firefox that does a similar thing.