I love Wappalyzer with Google Chrome and have been using it for a long time, but on Ubuntu 18.04 LTS + Firefox Quantum 59.0.2 (64-bit) it's much worse.
- Slows down loading websites, especially finishing the loading
- Seems to sometimes not like the uBlock Origin -addon
- Does not detect things at random before a page refresh (might give only HTTP/2 and nothing else, then after refresh I can see jQuery etc.)
A fantastic addon on Chrome, but with Firefox I'd choose to keep this plugin disabled until I really need it.