Specifically which extensions are you seeing that with?

There seems to be 3 types of coding used in extensions to create a contextual menu, depending upon what the extension developer programmed it to do. Complicating matters further would be an extension with a drop-marker menu added to the toolbar button; one drop-marker may open the context menu for that extension, while another may show the toolbar context menu. And if seems to differ slightly from what each extension did in pre-Fx29 versions of the same extension. - With AdBlock Plus the ABP context menu will show when the icon is clicked OR on right-click. - Stylish shows the context menu on click, but on right-click is shows the contextual menu for the toolbars. - UnMHT opens the UnMHT preferences window, while right-click opens the context menu for UnMHT.

And those actions may vary depending on other extensions the user may have installed. I am seeing different actions with Classic Theme Restorer installed.

I have Ghostery, Adblock Edge, HTTPS Everywhere, and OneTab buttons in the address bar.

I guess the only one I'm concerned about is OneTab, since you need to right click and use its context menu for specific functions.