misc (#1136)
misc (#1136)

- 0000: remove old XUL info, dropped in FF73+
- 0201: save 3 chars
- 0350: add default status for unsubmittedCheck
- 0351: change to enforce: has been default false going back to at least FF60, including current Beta/Dev/Nightly
   - along with 0602 `network.dns.disablePrefetchFromHTTPS` and 0603 `network.predictor.enable-prefetch`, I considered making them inactive, but decided it was good to leave them active for non-stable users just in case they get flipped
- 0515: add default status
- 0850c: remove info: out of date: doesn't work lilke that anymore and can't be assed figuring it out what with megabar and urlbar2 changes
- 0871: make inactive: default false since at least FF60
   - no need to enforce for non-stable in case it is flipped. It's a pretty minor shoulder-surfer privacy issue and the previews are small. If you're not sure what this pref does. On false you get one tab shown, on true you get as many as can fit across your screen. I squeezed in 15, and after that it became a list
- fixup `***/`
- shave off six lines and almost 400 bytes for you bastards
ghacksuserjs/ghacks-user.js,ghacksuserjs/ghacks-user.js