Maybe you've picked up some kind of Spyware/adware/trojan which is causing this. Try using Ad-aware/Spybot/A-squared to see if that is the case. If not try a fresh re-install of Firefox remembering to uninstall it first. This may solve the problem.
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New iPad 2017 preview: Apple's affordable but underspecced new iPad may appeal to the education…
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.