Firefox permissions issues
If you look at the right end of your toolbar, in the upper right corner of your screen, you should see a "puzzle-piece" icon like this one. Does it have a green dot beneath it when you are on an eBird page? If it does, you need to perform the following steps. If there is no green dot, you can stop reading; none of this pertains to you. But check for the green dot on each page.
Click on the puzzle-piece icon to open the "Extensions" menu, and click on the gear icon that is at the right of "eBird enhancements". Important! Be sure you click on the gear icon, don't click on the text to the left of the gear icon.
In the next menu, click on "Always Allow on ebird.org".
After this you should be all set.