Why firefox is constantly uploading stuff when no webpage is opened?

I recently noticed Firefox had been uploading for no apparent reason.
When no webpage is opened, Firefox uploads around 1MB per minute.
Furthermore, after hours of monitoring Firefox's behavior. I noticed Firefox established 200 connections for no apparent reason either.
My computer is pretty clean, and I don't have any "non-famous" plugin installed.(e.g: I only install world-known ones like: adobe flash, quick time etc)
I can't understand why a browser would need to upload information?

Hi waylander
Try to delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Multiple_profile_files_created
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).
Did you try Safe Mode?
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Why firefox is constantly uploading stuff when no webpage is opened?

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