GNU LibreJS blocks Pleroma-FE
Not sure if this is something that will be considered as important, but I'll add it anyway.
One reason why some people block JavaScript, is because they want to block non-free code. FSF has an browser add-on to do that called GNU LibreJS. I've tested (on Firefox, Pleroma v0.9.9999) and Pleroma-FE gets blocked by it. Pleroma-fe is FLOSS, so there shouldn't be a reason to get blocked.
I also found some information on how to "Set your JavaScript free(TM)" at https://www.gnu.org/software/librejs/free-your-javascript.html which may be helpfull