Manifest v3 is about add-ons or extensions like ad blockers, grease monkey, etc. Manifest v3 gets rid of some features of Manifest v2 that will severely hamper ad blocking. Mozilla has committed to keeping manifest v2 support in addition to v3 as a bypass to this

Per 2 hours even! Makes that 1500 hours

I don’t mean to poo poo FreeCAD the way I say this, but the vast majority of those features listed are bog-standard cad suite features at least by modern standards.

I’d love to see a FOSS cad suite kill my personal dependency on proprietary solutions, but as best I’m aware the UX is still hugely lacking.

The LEDs don’t particularly (unless it’s a very powerful one), their power supply does though. LEDs run on DC voltage, so they need a converter from the AC line voltage to not die instantly