Doesn't really bother me. One tiny extension and the issue is solved. uMatrix is interesting, but it has the downside of breaking most sites without a lot of fiddling to configure it properly. FlashBlock is a lot less powerful, but does work rather more simply overall.

It's easy enough to allow common frameworks/CDNs across all sites (and then use Decentraleyes to use local copies instead). Anything which breaks after that deserves further attention.

Thanks everyone for the suggestions and safety recommendations. I would surely look into them. More suggestions are also welcome.