I put settings that I want to keep into a user.js file which is in the Firefox profile directory. If you copy the line in prefs.js that sets the home page into user.js, it will be changed back to that if it gets changed somehow.

Thanks. I wish I knew what a user.js file is, or where to find the Firefox profile directory. Are these Windows things? I'm running on Mac OS.

How to set the home page

https://support.mozilla.com/en-US/kb/How%20to%20set%20the%20home%20page

Check and tell if its working.

You need to create the user.js file yourself, and put it into the profile directory. An easy way to do that is to use a chrome editor, which will do that for you. MR Tech Toolkit contains a chrome editor, and does many other useful things as well.

https://addons.mozilla.org/en-US/firefox/addon/mr-tech-toolkit/

> How to set the home page > https://support.mozilla.com/en-US > /kb/How%20to%20set%20the%20home%20page

Like I said, I did set my preferences to open to a blank page, and sometimes it does that (which is what I want), but sometimes it opens to the Google search page (which is what I don't want). Thanks for trying.

Sometimes it opens to the Google search page (which is what I don't want).

Next time this happen check if your Homepage settings get changed or not ..

>> Sometimes it opens to the Google search page (which is what I don't want).

> Next time this happen check if your Homepage settings get changed or not ..

I did; they did not.

-> click Firefox button and click Exit

Start Firefox in Safe Mode by Holding down the Option key while starting your Mozilla application.

As an alternate method, go to Utilities (in the Applications folder) and open Terminal, then run:

    /Applications/Firefox.app/Contents/MacOS/firefox-bin -safe-mode 

-> Firefox Safe Mode window will appear. DON'T SELECT ANY OPTIONS, just click Continue in Safe Mode

Firefox will open up with just basic Firefox. Now do this:

-> Update ALL your Firefox Plug-ins https://www.mozilla.com/en-US/plugincheck/

-> Right-click on Tab Strip and unselect All Unwanted/Incompatible Toolbars

-> click Firefox button, go to History Menu and click Clear Recent History... -> Time range to clear: select "EVERYTHING" -> click Details (small arrow) button -> place Checkmarks on Cookies, Cache -> click Clear Now

-> click Firefox button, click Options -> go to General section -> in Startup section click Reset to Default button

-> go to Content section -> place Checkmarks on:

1) Block Pop-up windows 2) Load images automatically 3) Enable JavaScript

-> go to Privacy section -> History section -> Firefox will: select "Remember History"

-> go to Security section -> place Checkmarks on:

1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries

-> go to Advanced section -> General -> Remove Checkmark from Warn me when websites try to redirect or reload the page

-> go to Advanced section -> Network -> Offline Storage (Cache): click Clear Now button

-> Click OK on Options window

-> click the Favicon on SearchBar -> click Manage Search Engines -> select all Unwanted Search Engines and click Remove -> click OK

-> click the Firefox button, click Add-ons -> Extensions section -> REMOVE All Unwanted/Suspicious/Incompatible Extensions (Add-ons)

-> click the Firefox button, click Add-ons -> Appearance section -> REMOVE All Unwanted/Suspicious/Incompatible Themes (Persona)

-> Restart Firefox

You can enable your Known & Trustworthy Add-ons and Themes later. Check and tell if its working.

Hey, mha007, thanks so much for that extremely thorough reply. Some of your instructions didn't match the version of Firefox I'm running (3.6.17 on Mac OX 10.4.11) but I did the things I could. And my problem persists: just now Firefox opened to "Firefox Start Page" with a Google search window in it. Sigh.

You can try:

• http://kb.mozillazine.org/Preferences_not_saved

Thanks, cor-el. I will try to follow some of the ideas in that link. But I have to say that I don't think that's the problem. My preference to open with a blank page appears to be saved; anyway, that's how it looks every time I open the preferences. (It does also show that Google thing as my home page, which I didn't ask for, so I've tried deleting that. But it shouldn't matter what's in the home page field if I set "blank page" as my preference, should it?)

-> click Firefox button and click Exit/Quit

Start Firefox in Safe Mode by Holding down the Option key while starting your Mozilla application.

As an alternate method, go to Utilities (in the Applications folder) and open Terminal, then run:

   /Applications/Firefox.app/Contents/MacOS/firefox-bin -safe-mode 

-> Firefox Safe Mode window will appear -> select Reset Toolbars and Controls and Reset All User Preferences to Firefox Defaults -> click Make Changes and Restart

Check and tell if its working.