I don't think there is any difference between Firefox and Chrome, except the speed issue.
One thing I hate about Firefox is that I used an extension called "Favicon Changer." This changes the favicons, and I was using it to customize my browser.
Well, Firefox disabled that in their latest update, or made it hard for the developer to update it. So he's stopped making it.
I switched to Chrome, and there is a developer making one for Chrome. So I'll stick with Chrome. I can't use my bookmarks and make them look neat and tidy in Firefox anymore.
Another thing I hated about Firefox is that they didn't save the customized favicons, so each time you reinstalled Firefox, you had to start from the beginning. And depending on your OS, it could take 10 minutes, or an hour, to update all the favicons. Chrome just....saves them, so that if you link a new computer, tablet, or smartphone with Google Chrome, they show up immediately. No tweaking needed.