Reproduce:

• In Firefox, goto Tasklist, open the filter edit dialog
• Focus the color input field using the keyboard TAB key
• Press SPACE to open the color picker

Expected:

• The color picker is focused and I can select a color using the keyboard

Observed:

• The color picker is not focused, I cannot select a color

Workaround:

• Using ALT-TAB to focus another window and then using ALT-TAB again to re-focus Firefox, focuses the color picker and it is then possible to select a color

Hint:

• A clean solution has to be implemented by the Mozilla Firefox Team. See https://bugzilla.mozilla.org/show_bug.cgi?id=421868
• We should investigate if there is a programmatic workaround we can apply to focus the color picker manually