Has you can see on the following capture, the window of the extension is too small then I can not access to all the fields nor to the "show password" button :
Hmm. You must have upgraded from a much earlier version, judging by the size differential. That or you initially edited something other than a web form login. But no matter, it's definitely a bug in this extension.
It would not be a problem if we could change the size of the window, but it is not possible in this case.
Ah, I apologize. I do most of the testing on Linux; here the window is
resizable. But Windows dialogs are not resizable by default. I'll look into it right away. In the meantime, try the following:
Find the file "<your Firefox profile>\extensions\firstname.lastname@example.org\chrome\content\pwdmgrOverlay.js"
(On XP, the profile should be at "C:\Documents and Settings\<your username>\Application Data\Mozilla\Firefox\Profiles\<something>" where <something> is partly randomized. I don't have access to other versions of Windows at this time, so I can't be sure where it is for you.)
Locate the two calls to window.openDialog() (there are two of them close to each other). In each one, change
Save and restart Firefox. Hopefully you should be able to resize the window at that point. I'll test this out and get a fix in. The above should help you out until the update goes up. Thanks for letting me know about this.