Yahoo! Mail, banking sites, hotmail, and many others have a setting to block autofill. If this setting is on firefox won't (prompt | ask) you if you want to save the password.
Go to this firefox bookmarklets site. Click ctrl+B to open your bookmarks. Drag the remember password box into your bookmarks. Next time a site doesnt want to prompt to remember your password, click ctrl+B, open the bookmark, and it will.
Why download and install roboform when firefox has a built in save feature that can work on all sites with this little tweak?
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