This. Firefox prompts for feedback semi-regularly. I seem to recall it even bends over backwards to make it end-user friendly by having "Firefox made me happy / Firefox made me sad" options. It seems like it would not be difficult to tie that screen to a secondary prompt that says, "Can you briefly turn on some additional telemetry for us so that we can try to fix the problem?" Let the users make that choice to temporarily lower their shields so that you can get some useful data out of their machines, in exchange for the implicit pledge that you will use this data for troubleshooting this one explicit issue (i.e. whatever prompted them to click "Firefox made me sad").
That seems like a reasonable compromise to me. I'm happy to send logs if my browser crashes whenever I visit a certain page, and if I know I'm gonna be monitored for that period, I'll isolate my browsing habit to only visit that page. I do not consent, however, to sending everything--even anonymized--on the offchance that Mozilla will see the crash events and use it to flag that domain and maybe fix the issue on that particular page.
That seems like a reasonable compromise to me. I'm happy to send logs if my browser crashes whenever I visit a certain page, and if I know I'm gonna be monitored for that period, I'll isolate my browsing habit to only visit that page. I do not consent, however, to sending everything--even anonymized--on the offchance that Mozilla will see the crash events and use it to flag that domain and maybe fix the issue on that particular page.