User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:77.0) Gecko/20100101 Firefox/77.0

Steps to reproduce:

in opzioni/generale/lingua, inserisco 4 o 5 lingue alternative, sia nel menu che nella visualizzazione delle pagine

in the options/general/language, I insert 4 or 5 alternative languages, both in the menu and in the visualization of the pages

Actual results:

se provo a inserirw una nuova ulteriore lingua scompaiono i tasti ok in basso della finestre non posso confermare

if I try to insert a new language the ok keys at the bottom of the window disappears and I can not confirm

It looks like the window keeps growing taller. Note that you can resize the window (drag the bottom right corner), but the behavior seems wrong, it should display a scrollbar at some point, instead of making the buttons disappear.

Redirect a needinfo that is pending on an inactive user to the triage owner.
:jaws, since the bug has recent activity, could you have a look please?

For more information, please visit auto_nag documentation.

Carrying over priority/severity from bug 1652195, hoping that's acceptable.

We had 2 bugs on file for the same issue (and a few dupes for each).

I think this should be a matter of just hardcoding a certain height to the richlistbox, say max-height: calc(<number-of-visible-richlistitems> * (1.8em + 0.6em + 2px)), or something.
(line-height + padding-top&bottom + borders)

The "righter" way to do this is adding a bunch of min-height: 0 to the
grid, the dialog, the content box, etc. But this is more similar to what
other dialogs do.