A true gem.
Works wonders.
I am surprised this is not more popular.

👁️ obsolete, the feature is already builtin without requirement for this addon:
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features#toggle_password_display

Exactly what I needed, thank you

After many tests with others, this was the only one that worked on the CHASE BANK WEBSITE. Thanks