The Firefox browser is undergoing some major surgery (this rebuild project is known as Electrolysis or e10s for short) which means some of your favourite extensions may not be compatible until the author updates them. I downloaded and installed the latest nightly  version of Firefox and ran some tests.
First of all I installed all my must-have extensions and tested them. Then I started adding in all the nice-to-have add-ons and tested those. Everyone works without a hitch.
Here’s a full list:
- BetterPrivacy 1.74
- Bluhell Firewall 2.5.3
- Cookie Whitelist, With Buttons 3.4
- Dummy Lipsum 126.96.36.199-signed.1-signed
- Extension List Dumper 2 1.0.1
- Forecastfox (fix version) 2.4.3
- HTTPS-Everywhere 5.1.9
- NewsFox 188.8.131.52.1
- NoScript 184.108.40.206
- Old Location Bar 2.2.1-signed.1-signed.1-signed
- Privacy Badger 1.7.0
- Tab Mix Plus 0.5.0.0
- The Addon Bar (restored) 3.2.9-compat-fixed-4
- TinEye Reverse Image Search 1.2.1
- Web Developer 220.127.116.11-signed.1-signed
How’s the browser, you ask? Just peachy. It’s fast even on old hardware.
 Mozilla release a version running the latest code every night, hence “nightly”.