The biggest downside to switching away from Chrome, is that you effectively lose access to Google Hangouts, because of how it is built into Chrome. Enter YakYak: an open-source standalone desktop app for Google Hangouts.
I have been a long-time Google Chrome user, but have been wanting to switch to Firefox for the past several months, but could not get myself to do it full-time. The interface was a bit dated, and the browser in general didn’t feel faster. I used Firefox Developer Edition for a while which had the newer UI now available in Quantum, but the lack of plugin/add-on support killed my web surfing experience, and I ultimately went back to Chrome.
Then everything changed when the Firefox team announced Firefox Quantum. I downloaded it to try it out, and was off to the add-on site. The team did a good job ensuring most of the popular add-ons were up-to-date and working with the new changes in Quantum. I was able to quickly find and install the add-ons I needed, and have been using Firefox full-time ever since. It’s a joy to use, and consistently uses significantly less memory than Chrome. It’s my new go-to. Congrats, Firefox team – thanks for the hard work and the great release!