[Feature request] Add a confirmation dialog for "Remove All"

[tsaost]

Thank you for this great extension. I use it on Firefox all the time.

Today I clicked on "Remove All" by accident and now I have to start from scratch again.

It would be nice for it to have a confirmation dialog.

Alternative, have a way to import/export the white list, then one can recover the whitelist if it was wiped out.

[tsaost]

Update: I read the source code and found that there is a confirmation dialog. Maybe it did pop up and I probably pressed Enter too quickly to see it. Still, a way to import/export the list would be nice. Thanks