HTML action menu

[Luca Ferrari]

Hi all,
there is a problem that is really annoying me: I don't know which
setting has changed after the last update of my Kubuntu running KDE
4.11.1 but when I double click the URL bar in firefox the "HTML
Action" menu pops up, and this often results in the accidental
selection of something I don't want to start. Moreover, when I hit
CTRL to select something with the mouse another menu pops up and also
within Emacs, when I delete something that resemble a file name a
"Folder" menu pops up.
How to disable this set of pop up menus?

Thanks,
Luca