This is realistically solvable. 1. First, by Mozilla analysts & developers making a good job at rolling out a potential implementation in a safe progressive wa

This is realistically solvable. 1. First, by Mozilla analysts & developers making a good job at rolling out a potential implementation in a safe progressive way, with the easiest stuff first (`fbclid`, `gclid`, etc), and then going deeper / per-site, maybe re-using (part of) existing filterlists. 1.1. Also, note that ClearURLs is quite aggressive (as noted by a few commenters, and I confirm): it strips lots of non-URLbar requests, strips ETags, etc. A sibling comment mentions that alternative NeatURL is less aggressive. As with all cat-and-mouse games, this is a trade-off, and an implementation in core Firefox doesn't have to go as far as ClearURLs, at least initially. Offering a strictness knob to users is also an option. 2. Then, Firefox already has UI to disable Tracking Protection and work around sites broken by it: click the shield at the left of your URL bar, then toggle off "Enhanced Tracking Protection is ON for this site" to see if it was ETP that broke the site. This UI maybe need adjustments / more granularity (and maybe not), sure.