If you have recently installed/upgraded to firefox version 3.5.5, you may have faced the right click problem on pages. I experienced the same and found a solution. Now right button click works well for me.
This is a very simple fix but you have to know the secret..lol. If you are facing the same problem, you may try uninstalling “Yahoo Toolbar” from firefox addons list (Tools > Add-ons > Yahoo Toolbar > Uninstall).
Just wanted to share this simple but important fix.
Thanks.
Rupom Here 
thanks a lot. it worked.
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It may be AN answer but its not THE answer, at least not for me it isn’t. I don’t have Yahoo toolbar installed and I still have lost my right click in 3.5.5… 8^(
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AH ok. Actually it worked for me and some other people. So I thought it would be something good & helpful to share.
Thanks.
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Thanks a lot. It worked for me.
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I’m glad that it helped you.
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This is the third solution I found and the first one that worked. Thanks!
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Worked for me thanks! Friggin Yahoo.
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thankyou
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thank u it worked for me
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It’s ok.Thanks a lot.
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You may have hidden or disabled the yahoo toolbar but never got rid of the addon. So although you don’t physically see the yahoo toolbar, the addon would still be in firefox. It works for me
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thanks! this actually worked 🙂
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Great! it worked…
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It worked and I am SO grateful!!!! Thank you thank you thank you!!
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Actually, all I did was go to tools/addons then exited the menus and got my right-click back. I didn’t have Yahoo installed.
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This worked for me!!!!
My mouse right click menu stopped working/appearing in Firefox on my laptop usb mouse…
In the “Tools” menu under “Add-ons” I selected the iobit toolbar then click “disable” and then the browser wanted to restart…
IT WORKED!!!!
I also disabled the yahoo toolbar using the same method but it was the iobit toolbar that did it!!
–> THANK YOU! <—
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