Since I updated Firefox to version 31.0 I am unable to change the cell color of tables on existing pages. This still works fine when I test with Internet Explorer 10. It also works fine when creating new pages.

Steps to reproduce:

1. Open an existing page that contains a table
2. Select the cell of which you want to change the color
3. Click on the "Change cell color" drop-down
4. Try to select color

Actual result:
The mouse cursor changes immediately from the "hand" to the regular mouse pointer after which it is not possible to select the desired color. In other words: nothing happens.

Expected result:
As with other drop-downs in the editing menu bar, I would expect the cursor to be the "hand" type and be able to click on the desired color after which the cell color should change.

Additional info:
I noticed that this also applies to the drop-down for the text color, where only the colors that are shown below the editing menu bar (i.e. over the edited pages) are inaccessible.