See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
• Recovering important data from an old profile

• http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox
• http://kb.mozillazine.org/Password_Manager

Thanks for a very useful list of links! Yes, with your help I made the necessary changes & it worked well enough. There's a small detail that I, inadvertently, left out of the discussion, though: my changes when I use the Preferences button within the Edit menu item. I searched through all the folders contained within my last version of FF & found a file that I suspect contains part of the info I need to make it persistent: "browserconfig.properties", located within the Firefox root/main folder. The changes I made there consists in replacing '2' web addrss instead of the Mozilla ones that come as default. Haven't tested it yet. The other point within my Preferences is the text size I usually use, but I didn't find an editable file or not that could suggests in its name this purpose. So, for now, all I'm waiting for is to see if my implemented changes work out well. After that all that I need is to locate an appropriate file to edit or copy after performing my preference changes... PS. If you know that I made a mistake by changing those addrss. or know the file/location of my 2nd issue & share that with me/us it would be very much appreciated.

I thank you all for the help, I found a solution suitable for my problem! Now, I've a related issue yet to be solved...

...I need to change the font size each time I start the browser. I think that a solution similar to the one implemented for the other issues is applicable here. I tried some files but, apparently, was using the wrong ones.

I would like to know where & how (what file format) FF saves the changes made in the font size configuration within the Preferences tab in the Edit tab?

Thanks in advance for any help any of you post pertaining to this!

Those settings are saved in the file user.js in the Firefox Profile Folder

You can see a description of all files in the http://kb.mozillazine.org/Profile_folder_-_Firefox article.

You can set the default font sizes on web pages with one of these extensions:

• Default FullZoom Level - https://addons.mozilla.org/firefox/addon/6965
• NoSquint - https://addons.mozilla.org/firefox/addon/2592

Thanks for the prompt reply cor-el!

The 'prefs.js' file was not easy to find because it was somewhere else. I didn't find within it an entry in reference to this issue, so I didn't make any changes to it. I found an updated file & copied it to my profile folder. Haven't yet restarted the browser to see if it's responding ok to these preferences. I'll post the results as soon as I reboot later on the day...

See also:

• Help > Troubleshooting Information > Profile Directory: Open Containing Folder

Thanks cor-el for the tip! I used this approach but when clicked on "Open Containing Folder" nothing happened.

Am I missing a FF file (executable/script/configuration) on this downloaded copy?

I'm using { Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 }. This isn't the PET file I mentioned above.

For me Nautilus opens the profile folder when using that link.

Copy and Paste this code in the Code field in the "Tools > Error Console" and click the Evaluate button to see the location of the profile folder.

alert(Components.classes["@mozilla.org/file/directory_service;1"].getService(Components.interfaces.nsIProperties).get("ProfD", Components.interfaces.nsIFile).path);

Experimenting now with FF's ability to retain sign-in data for sites & forums...

Thanks, the last technic gave me the pointers I needed to locate the file.