A must have Extension!

However I can confirm the problems with "disable restrictions for this tab"
It started with version 10.1.8.17
Whenever restrictions are disabled the site will not load correctly and Firefox will become stuck in a loading loop.
This will also result in high cpu load.
Mainly FirefoxCP Web Content + WebExtensions

I also use an additional ad blocker (ghostery) but disabling it won't change anything.

10.1.8.20 no joy

Only solution so far... reverting back to .16