How do I change blank pages to show the Google page as they used to?

You don't need an Addon to do this.

1. In the Location bar, type about:config and press Enter.
   
   • The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page.
   
   
2. Type browser.newtab.url in the search box.
3. Double-click the browser.newtab.url preference and change the url from about:newtab to about:blank. Alternately, you can change it to about:home for the Firefox Google home page, or type in your preferred home page, for example google.com.
4. Click OK and close the about:config tab.

New Tab Page – show, hide and customize top sites | How to | Firefox Help

Was just giving the simple solution save him poking around in Cfg, hell why he is in there may as well change the Browser.sessionhistory.max total viewers value just for fun we all love Firefox well i do anyway

Try resetting your firefox to it default values and go from there just remember to save all your bookmarks you can do this just by exporting as a html file and save to desktop for later use.
To reset firefox to default simply type (firefox -safe-mode) in Run check all boxes and hit restart, your browser will now be brand new and bug free. Set your home page to what you like and install the addon I pointed you towards now all should be OK.

Vic123 said:

I didn't realize there were 2 pages.

Alabama: I've gone to this point but still no cigar:




I've even set both lines to false.

Type browser.newtab.url in the search box.

In the Location bar, type about:config and press Enter.
The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page.
Type browser.newtab.url in the search box.
Double-click the browser.newtab.url preference and change the url from about:newtab to google.com.
Click OK and close the about:config tab.

Then Google will open in a new tab.

Glad you got it fixed the way you like it.:)

Thanks for posting back.