Stylish was blocked because it is sending your complete browsing history to the developer of the add-on. I suggest uninstalling it, and using Stylus, https://addons.mozilla.org/firefox/addon/styl-us/ It works almost exactly the same, but respects your privacy.

''Dddsasul [[#question-1224591|said]]'' <blockquote> So Stylish was disable because of "security reasons" when I updated FireFox. I went and re-enabled it. My question is: Will I need to enable it every time I open the browser and will it permanently be removed at some point? If any of those answers are yes I'm gonna have to change browsers again cause I refuse to use a browser that won't allow me to customize my pages. It hurts my eyes when I see a white page during the night so Stylish literally saved me. Imo blocking Stylish is a really bad decision. </blockquote> The block was made on July 4th before the 61.0.1 update today for a very valid reason. It will be disabled, not removed. Users will get a warning though with a request to (optionally) restart the browser. addons.mozilla.org/blocked/ https://blocked.cdn.mozilla.net/i1900.html https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/ As said you can switch to an alternative like '''Stylus''', an offshoot from the good old version of Stylish that works in much the same way, minus the spyware. https://www.ghacks.net/2017/05/16/stylus-is-a-stylish-fork-without-analytics/ Also a Steps for Migrating Data from Stylish to Stylus post at https://discourse.mozilla.org/t/stylish-to-stylus-migration-how-to-help/29903