WILL NOT ALLOW SELECTED SITE TO LOAD UNTIL "ALLOW" IS CLICKED AT TOP RT OF SCREEN. WANT TO ELIMINATE THIS STEP

Question

when accessing selected sites, firefox will prevent until the "ALLOW" box is selected at top right corner of page. I would like the page selected to load without this required step.

Answer 1

A transition (in your case a cross dissolve) is limited by the length of the 'handles' that exist at the beginning and end of the clips involved.  For a balanced 1-second cross dissolve, there need to be at least 15 frames at the end of the outgoing (first) clip + 15 frames at the beginning of the incoming (second) clip that are  'handles'.
Handles are the frames between the start point of a  source media clip  and the IN point you set in that clip; and between the OUT point of the clip and the source media end.
If your IN point = the media start point of the source clip (ie 00:00:00;00) then there are no handles at the beginning of the clip.  If your OUT point = the media end point of the source  clip, then there are no handles at the end of the clip.
In the example of a 1-second cross dissolve
The OUT point of the outgoing (first clip) would need to be at least 15 frames before the end point of the underlying source clip and
The IN point of the incoming (second clip) would need to be at least 15 frames after the start point of the underlying source  clip.
Here is an illustration from Piero Fiorani's excellent description of timecode including handles: