In your Program Files you'll find Mozilla Firefox, or perhaps Firefox.
Opening that sub-folder you'll find the "core files" that make Firefox work.
Also typing in the words
into the addressbar (where the URLs are normally found at each page you are on)
and hitting "go" or the "enter" key
will give you access to all the CODES that make Firefox work.
any of the listings found there in boldface
since the default settings at installation.
NOW, before you get the wrong idea ...
certainly isn't a good idea to start clicking changes.
It is good to know, though.
C:Program FilesMozilla Firefoxdefaultsprofileookmarks
is good to know, as that is where your current up-to-date bookmarks are.
You can view them there.
You can copy that file to (say, desktop, for instance) to safeguard it.
If the situation arises again, just get your good file (copy) into it's place again.
meaning add it and delete the other ... or over-right the bad one in other words.
Not the answer, but some clues to use.
BTW, about config lines can be right clicked for additional "context menu" options.
Copy Name can be used, then paste it (any) to a notepad (or wordpad) and also google searched for answers to the questions you will have about them.
It's a start.
Oh, and Tools>Options at the top can provide you with quite a few things
to keep track of so you can find out if changes (unexpected) may have occurred)
Edited by phawgg, 09 March 2005 - 10:36 PM.