You coule give Fennec a try, its basicly Firefox without the questionable bits

*Cis Hetero Men

Metallworker Here.

Yes that piece at the top is the inner part of the former bearing so it needs to be removed before you can put on a new one.

The bearings probably have a slight interference fit on the axle so you would need to use a gear puller, heat them or cut them to remove them (tho the gear puller is to be prefered because it hast the least Chance of damaging the axle)

The axle still Looks fine to me, so if the bearings surfaces and the threads are in good condition you can continue to use it.

Before you press the new bearings on make sure to watch a Video or read about how to do it properly so you dont damage your new bearings and get the most runtime out of them.

Oh, and inspect the rest of the wheel, maybe the axle is OK but other parts are also failing and would be harder/Impossible to fix.

Dude in grey is sleeping and we dont see the legs(might wear shorts)

Check for the cabels and outlets to see if there is anything wrong with the electrics in your home

Looks like a jig you put an a saw or a router to follow a edge with a given distance.

Seems like a farsighted move to get rid of the upper class