If you cant find anything else because you cant live without extensions a , b, & c
Finding and removing conflicts in extensions/plugins a good place to start
Firefox uses too much memory (RAM) - How to fix
https://support.mozilla.org/en-US/kb...uch-memory-ram
Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
https://support.mozilla.org/en-US/kb...o-fix-problems
Extension Conflict Troubleshooter for Firefox
https://addons.mozilla.org/en-US/fir...t-troubleshoo/
Plenty of other browsers use the same rendering engine
but you'll be sacrificing the choice of add-ons.
“Pale Moon browser is a stripped-down version of Firefox, that leaves out certain features, to focus on speed of browsing”
http://www.thewindowsclub.com/firefo...e-moon-browser
List of 25 alternative browsers for Windows
http://www.thewindowsclub.com/list-o...rs-for-windows
How to Select a Browser
- lists browsers by type (mega, light & specialised) & rendering engine
http://www.techsupportalert.com/best...select-browser