Separate Issue; Your System Details shows;

Installed Plug-ins

Adobe PDF Plug-In For Firefox and Netscape 10.1.14 Adobe PDF Plug-In For Firefox and Netscape 11.0.11
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer. lnguyen1587 said

it automatic log me off from pg and e website

Firefox logs you off a site on it's own? It should not do that.

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac Options) key, and then starting Firefox. Is the problem still there?

when use Firefox i have this problem. If use Chrome or Internet Explorer then everything fine. I did try safe mode and problem still there. Let me explain the detail of the problem. After log into the website. I can click back and for within their site. Only if I go to see my data usage, it took me to another page and then within this page when I click to see many option then automatic log me off the pg and e website completely.

Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

If there is still a problem;

You may have a corrupt cookies.sqlite file.

Type about:support in the address bar and press enter.

Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the cookies.sqlite file. Then rename or delete it. Restart Firefox.

It still does not work. It logged me off and show the login page again.

I've called the big guys to help you. Good luck.

I assume the main site is pge.com or www.pge.com. Is the data usage on another server under pge.com like usage.pge.com or a completely different server like mydata.com?

Do you allow so-called "third party" cookies? This article describes how to set your cookie settings for maximum compatibility: Websites say cookies are blocked - Unblock them.

Yes, I can navigate in www.pge.com website without any problem. When I click into the data usage it took me to another server www.pge.opower.com, I can get in and see the first page, First click on any option it will get me to that specific area/page to see but my second click on any option will log me off and get back to www.pge.com login in page. Thank you for all your guy help