If in some websites their drop-down menu doesn’t work, you can check if you have enabled (in that websites) the “Absolute enable right click” extension, that can interfere heavily with javascript. Try to disable it, and you can see if that was the problem.
Problems with Google maps and search
If you have enabled the extension Absolute Enable Right Click & Copy, you could have (at least) two problems with Google:
1. in Google maps you cannot use ctrl+mouse to “move” the (focus of the) map
2. in Google search box tha key “enter” don’t send your query but mean “line break” (you go to a new line below)