content: Account Deleted By User I nearly switched to Chrome, because Firefox was incredibly slow. I then enabled e10s and I will certainly not switch to Chromium anymore. Firefox now uses 550MB RAM with 30 tabs open. Before enabling e10s it used 1300 with less tabs open, was slower and used a higher percentage of my CPU. I have no idea what they did, but it's great. So, now that you're curious, here's how to test it: First, update Firefox to 50. Using a 64bit version is also not a bad idea, but probably not necessary. Open about:support and see if Multiprocess Windows is enabled. It should show 1/1 or 2/2, depending on the amount of windows you opened. If it's enabled, you should already have noticed a significant performance boost. If it's not enabled, install this. If your add-ons are compatible, follow these steps: Even if your add-ons are not compatible, it might work. I've got one incompatible add-on that I didn't disable, but didn't notice any problems. If something doesn't work, just change browser.tabs.remote.force-enable to false and everything should be back to normal. Don't blame me if it doesn't. These instructions are from the official Wiki.