Budget times for website use.
Eliminate mindless clicking and revisiting the same sites over and over without outright blocking a site you may want to use sometimes.
Set number of minutes (maximum) allocated per day for a site by clicking on extension icon. When time is up, a block appears over site content with a motivational message urging you to get back to what you really want to be doing!
I built this for me to help control time spent browsing because I couldn't find anything like it. Hopefully it helps you too!
I didn't make a privacy policy page, but extension sends no data externally, contains no ads, performs no telemetry and is entirely self contained.