Extension and Options disappear on "Alt+Tab" window change

[ghost]

This issue covers two related bugs:

1. When you open the extension in Firefox, and then Alt+Tab away from it to a different window, and then Alt+Tab back to Firefox, then extension has disappeared! The behavior I want is for the Extension to stay open across Alt+Tab window changes. Video demonstrating the problem: https://drive.google.com/file/d/1ZROnpZBJJ4wzeFyJsXSXh2ZZ3_plQslR/view?usp=sharing

This bug occurs on Firefox for Mac. It does not occur in Chrome.

2. Even if you ignore the problem in Readme update #1 above, there is still a problem with Options values disappearing within the extension. See video description here: https://drive.google.com/file/d/1U_yDJE_FKvY5BB2-FM0aW4-t5YJFx4kz/view?usp=sharing

The desired behavior is that when you Alt+Tab away from the extension without having saved the values, they should still remain populated in the Options fields. After all 4 values are filled in, the user should then press Save.

If the user tries to move away from the Options tab without pressing Save, a message (like a modal dialog) should pop up warning that "You have unsaved values in the Options fields. Please press Save to set those values." The fields that are filled in but not yet saved should be highlighted, and pressing Save should remove the highlight.

This bug occurs in both Firefox and Chrome (on Mac).

[ghost]

See also #22. Possible dup of #22.