I switched from Chrome to Firefox a few months ago and am mostly happy, with just a few annoyances:
There's a setting to prompt "are you sure" before closing Firefox, but it doesn't actually work. I really miss this feature (which works as expected in Chrome) since unless I'm turning my machine off a pretty much never close my browser intentionally
Shortcuts in text input also work differently than every other program on my computer. Command-backspace deletes the whole text field, not just the text before the cursor. ^t doesn't transpose, ^k behaves differently when text wraps, etc
Yeah, there's some arguments about that on their bug tracker page and it looks like someone tried to change that code but it never went anywhere. If you horde tabs like I do it can still waste a lot of time to restart the browser and wait for the session to be restored.
Pretty consistent. I haven't timed it, but it certainly feels like more than 15 seconds for my 50-100 tabs. I'm not in quite as pure of a situation as that benchmark though-- I have plenty of other programs using memory and I'm waiting for the page to actually render. During some of my Firefox launches lately I also had a bunch of other applications launching at the same time since I was trying to debug a WebGL page that sporadically hangs/reboots my machine (in both Firefox and Chrome)
There's a setting to prompt "are you sure" before closing Firefox, but it doesn't actually work. I really miss this feature (which works as expected in Chrome) since unless I'm turning my machine off a pretty much never close my browser intentionally
Shortcuts in text input also work differently than every other program on my computer. Command-backspace deletes the whole text field, not just the text before the cursor. ^t doesn't transpose, ^k behaves differently when text wraps, etc