Clean Computer

1. Delete Stored Password in Firefox
1) In Firefox click Tools > Options.
2) Click Security at the top.
3) Click the Show Passwords button.
4) Find the web site you wish to remove in the list. Click/highlight it with your mouse.
5) Click Remove and click Close then OK when you are finished.

Firefox doesn't allow duplicate bookmarks

When I add a bookmark to a folder using "Bookmark This Page".....I sometimes WANT to add the same page to another folder, but it quietly removed the bookmark from the first folder.

I had to use Copy & Paste to make a copy of the bookmark.