Firefox cant connect to the internet after a while of being on

Question

Hi,
I posted this question some time ago and since i didnt get any working solution and I still have this issue I am reposting it now. My problem is simple: I start up my computer and open Firefox. I browse the internet normally. No problem so far. But lets say I go to take a nap or I just stop browsing to do something else on the computer without closing Firefox or whatsoever. After a while I go back to browsing on Firefox (the same window with the same tabs are still open) but now no page will finish loading no matter how long i wait.
So I close Firefox and open it again. Then I get a popup error saying Firefox is still running and that i need to close it. When i close that popup then i get another error saying it was unable to load my profile. I close that and reopen Firefox. Now it loads pages normally again but but only for 1 or 2 minutes and not any more after that. I repeat the whole process and i still get the same results until i restart my computer.
I have checked for any viruses and i have none at all and there is absolutely no problem with my overall connection since no other programs have this problems only Firefox. What can i do?
Thank you.
Edit: Im having the issue right now and I just checked but seems like some tabs work and some dont so i really dont get it.

Answer 1

Hi again,
I have been testing and I still have this issue. I ran the recommended antivirus multiple times and seems like i got rid of the speedbit malware and so but it didnt any good. What can I do now? This problem is driving me crazy.
Thank you.
UPDATED TROUBLESHOOTING INFO
Application Basics
Name: Firefox
Version: 36.0.1
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
All Crash Reports
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End Date: 1420196138488
Homepage: