I used to be a long time Opera user but it fell behind; then for years I've used firefox, but it seems to just eat up more and more memory with every release.

The one and only reason I haven't been able to switch away from firefox is the great extension FireGestures. It is completely customisable and works perfectly.
The Opera default is ridiculous and the chrome gesture tools do not work well when installed on Opera (through Download Chrome Extension) because they hijack the right click and either disable the right click functionality, or it goes through exactly one time out of two; I have tried five plugins and they all have the same problem.

Is there a solution to customise gestures in Opera or should I give up on it again?