Sometimes when I click the icon, it won't start and other times it will.

I click the icon in the bottom left (once) but Mozilla never comes up. I right click and select open on the icon in the left of the desktop, but Mozilla doesn't open. I go to "programs" [on windows 7], select Mozilla, but it doesn't open.
This doesn't happen all the time. Often if I have the problem, it loads fine if I restarts. Sometimes restart results in "a start over" where there is just the basic Mozilla with no past bookmarks, so I have to go to restore system on Windows 7 and it works fine after I restore 1-3 times, then we start all over again.

Hopefully this support article is what you need:
https://support.mozilla.com/en-US/kb/Firefox+will+not+start
In any case, it's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] (don't forget to select ''Disable all add-ons'' when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and themes and [https://support.mozilla.com/en-US/kb/Troubleshooting+plugins this one] for plugins.
If you need support for one of your add-ons, you'll have to contact its author.
If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.

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