I like firefox a lot, it's the browser I use almost all of the time.

I really like the way firefox allows me to sync bookmarks across devices.

I really like the fireftp add on.

I don't like the way firefox makes me wait sometimes while it updates.

It's really hard to figure out some things.

One time I accidentally forgot to press the tab key after entering my username on log-in and entered my password in the username box (in plaintext). It took ages (even after googling) to figure out how to stop firefox offering my username+password as a log-in suggestion