👁️ 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

На большинстве сайтов работает нормально, но иногда - никак.

Hhhh

Great addon that has a 'Show' next to the password where you can just click on it and it will be revealed

Truly a handy app for when you have a password stored on your browser but can't remember what it is.

Please reformat the revealed password into monospace font for readability.
A Chrome extension revealed the password on mouse hover. I'm not suggesting that is better but worth considering.
Great extension.

it is good, but not safe in browsing;
Save password in browsers not safe! (in case keylogger or spyware, if you absent hacker can leverage and read saved information

This works most of the times and when it does, it's very helpful. However, sometimes, even though the text Show is there in the red box, it will not reveal the password.