The polyfill.js is a popular open source library to support older browsers. 100K+ sites embed it using the cdn.polyfill.io domain. Notable users are JSTOR, Intuit and World Economic Forum. However, in February this year, a Chinese company bought the domain and the Github account. Since then, this domain was caught injecting malware on mobile devices via any site that embeds cdn.polyfill.io. Any complaints were quickly removed (archive here) from the Github repository.
I’ve been using noscript for years. I don’t even have to open up the blocklist anymore because I’ve successfully unblocked only the necessary scripts on all sites I ever visit. I get no trackers, no bloat, no google analytics, no Facebook, no microsoft, no ads, and no adblocker notifications.
Yeah, it took me about that long to get my regular websites working right too. And then i had to reinstall for unrelated reasons and all that customisation was gone.
While you can back it up, at least once you’ve suffered the loss multiple times you can get it 90% back on first re-visit after reinstall.
It takes 2 clicks to get a website to work. It took a few minutes for me to get all my most commonly visited websites to work. And you can backup and restore so it takes a few minutes to sync the customization to all devices.