I'm running Windows 7 with Service Pack 1, Java 8 Update 45, Java 8 Update 45 (64-bit), Flash Player 17, Adobe Reader XI (11.0.10), Avast! (2015.10.2.2215). Last week, opening a blank Firefox page took about 2 seconds. During my weekly software check this week, Firefox showed there was an update for Adobe Reader. That was curious because Adobe Reader showed no updates available. Nevertheless, I clicked on the Firefox update button and discovered Adobe Reader DC was available. I loaded Adobe Reader DC, which wiped-out Adobe Reader XI. Immediately, Adobe Reader DC needed 6 different pass-through's. I only need Adobe Reader to open PDF files; nothing more. I unloaded Adobe Reader DC and reloaded Adobe Reader XI. Now opening a blank Firefox page takes 30 seconds. First, the whirlpool (i.e. busy) appears for 5 seconds and then disappears. I must wait another 25 seconds before the Firefox window appears. If I already have a Firefox window open, then the next Firefox window opens in 2 seconds. = I restored my system to 2 weeks ago – didn't help. = I reset Firefox – didn't help = I unloaded Firefox through Programs & Features, removing all the Mozilla sub-directories. I then loaded a completely new Firefox – didn't help. Any thoughts? This same 30 second delay also happens to Internet Explorer.