There is a conflict between Passwordmaker and
WebmailCompose. WMC is an extension which intercepts "mailto:" requests and converts them into the mail composition page of whatever web-based mail service you may use.
When WMC is enabled, PasswordMaker intermittently flakes out in its "CoolKey" behaviour. I type in my master password into the CoolKey dialog box and absolutely nothing happens. Nothing gets logged either that I can determine.
If I have "Store master password" set, then the master password does not get set. The login form fields are left blank and I can CoolKey again and get the "enter master password" dialog again. Note that this is intermittent; after a couple of tries, the master password is recognized and after that point CoolKey works as expected -- with "Store master password set", I don't need to enter it again for the Firefox session.
I'm running PasswordMaker 1.6.1 (after upgrading; I saw this behaviour in 1.5.x also), and WMC 0.6.6 (the aforementioned site says it's 0.6.5 but when you install you should see it's actually 0.6.6).
Thanks for a great extension!