No, that is why there is a warning window that pops up before you enter about:config. You should have copied down what changes you made before hand.

With that said the only way to reset about:config is to start new Profiles - Where Firefox stores your bookmarks, passwords and other user data.

If you read threw you will find you can backup your info and restore it to new Profile or even coping stuff from your old profile. This can be labor intensive the first time threw but you can always return to the old Profile if you feel it isn't worth it.

And it will teach you how to have your backups ready when this happens again, cause you know you will do it again.  ;)

Creating a new profile will return all of your Extension/Add-ons settings to default, you will need to re-install the Extensions/Add-ons in the new profile

Most of the settings that you probably set to different values are in about:config, then Filter = network.http (I show 24 items in Firefox 6, all with "Status" = default)

• Any that are shown in the lower panel in bold and as user set are items that have been changed by you and/or an extension/add-on.
• You can right-click those items, in your case the ones generally shown as "integer" types, and choose "Reset".
• Any that re-appear after you restart Firefox are possibly being changed/added by an Extension; there were/are several extensions that change these settings
• After "Reset", any with a blank value (there should be none of these in network.http unless you added them), will be deleted when you restart Firefox; those are items that are not of the default set of hidden preferences in your version.
• Keep a list of what you are changing in your hidden preferences (about:config) so that you can reverse those changes later if need be.
• List of network.http preferences: http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries#Network.
  • The list is not totally current or complete, but is the best reference we have at this time
  • Don't add any new items to your preferences, unless you know what you are doing
  • Don't remove/delete any items from your preferences, unless you know what you are doing
• See: http://kb.mozillazine.org/About:config

If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

See:

• http://kb.mozillazine.org/Firefox_crashes
• https://support.mozilla.com/kb/Firefox+crashes

If you have submitted Breakpad crash reports then post the IDs of one or more Breakpad crash reports (bp-xxxxxxxx-xxxxxxxxx-xxxx-xxxxxxxxxxxx).
You can find the IDs of the submitted crash reports on the about:crashes page.
You can open the about:crashes page via the location bar, like you open a website.

See:

• http://kb.mozillazine.org/Breakpad (Mozilla Crash Reporter)

You are quite right about making notes/back-ups... Lesson learned. (Actually I did "write" down the changes back in version 4.x then lost the paper... Derrrr) I thank you for your time to answer my query though. Paul PulpKult....

Thanks for replyling. I shall do as suggested... Take care...

Paul PulpKult.