As of the current Firefox release, if you use the Strict tracking protection, all websites are set to Strict. If this breaks a website you have to disable ETP for that website, which enables all trackers instead of only some. This can be fixed by allowing the user to set the ETP levels per site, so if a site is broken, you can just set the site to load with Standard ETP instead of turning off ETP entirely.
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I think it's a good idea. Many websites will work without having to completely disable tracking protection.
But when a website isn't working don't you fix simply disabling the protection for that website temporarily? You give an exception for a while, you shouldn't have disabled the whole protection.
I might be a bit late, but this request still has the "new idea" status so instead of creating a new thread I'll write here.
I was thinking basically about the same thing, but with much more granular level of control. So instead of setting ETP levels, user would be able to allow requests to certain domains per domain/site level.
In the end, it may look a bit like what Privacy Badger or uMatrix allows us to do.