I cant scroll on facebook. it is locked - Computers & Internet

As you don't mention what advice you've followed, it's rather difficult to come up with new advice ....
But first (and this may or may not have anything to do with your problem) :
Your system details show that your Adobe Flash needs to be updated - you're running a very old version, which can cause problems.
Would you please uninstall your current version and install the latest version, which is 32.0.0.192
Uninstaller : https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html
https://get.adobe.com/flashplayer/
Note : some 'extras' may be offered in the download.
Would you try this please :
Reload the page : Hold down the Shift key and left-click the Reload button or press 'Ctrl + F5' or press 'Ctrl + Shift + R'
Would you try this please :
Clear the Firefox cache :
https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
"Remove the cookies" from websites that cause problems :
https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored (scroll down to : "Delete cookies for a single site")
If none of the above do the trick, then let's Try Firefox in Safe Mode :
If Firefox is not running : Hold down the Shift key when starting Firefox.
If Firefox is running : 3-bar menu => ' ? ' (at the bottom of the dropdown) => 'Restart with Add-ons disabled'. Then OK the restart. A small dialog should appear. Click 'Start in Safe Mode' ( not 'Refresh' !)
See : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
And : https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems