Wappalyzer has always been one of my 'must-have' add-ons, but recently it became too heavy on resources! I find my laptop fan spinning too much while doing nothing, and after I opened Firefox' `about:config` I found this addon uses a most of resources.
Now you need a pro account to use it... It doens't work free anymore. New version (v6.7.7 isn't free, no changes). TicTacToe fails and We can't watch information, I'll delete this addon and install Whatruns which still be free. Thanks for all this time