Yeah I been having lot of issues with latest versions of Firefox, their memory handling seems not to be very good, earlier versions are better in this aspect and as you mentioned, they don't consume many resources.
I hope they fix these issues for the future versions because at this moment I believe Firefox is one of the best browsers (if not the best).
SeeYaa!
![grin :biggrin:](https://neo-source.com/Smileys/default/grin.gif)