My OS is Windows Vista and I have used Firefox for several years with hardly no problems but for some months, starting with Firefox 14 (or 13?), it is now very, very slow.
I use ADSL connection (broadband) with a speed of 6-8Mbit/s and the response time for Firefox is now around 120ms and receiving speed around 0.6Mbit/s. Sending is normal, though, with about 0.89Mbit/s. I also have Netscape Navigator 9 and Explorer and they are still fast, 7Mbit/s and 0.89Mbit/s (receiving and sending) and a response time of about 15ms.
What have I done to solve the problem? This is what I have I tried:
- Searched for virus and trojans
- Safe mode.
- No add-ons.
- No plugins.
- No bookmarks.
- Cleared cache and history.
- Updated add-ons and plugins.
- Shut down anti-virus and firewall.
- Reinstalled with the Firefox button in the help menu.
- Made a complete reinstallation after removing all profile files etc.
- Changed the DNS servers.
- Tried about:config and changed values
Yesterday I installed the Comodo IceDragon, that is almost identical to Firefox 15, and suddenly the speed was 7/0.89Mbit/s but, alas, only once for the Dragon and once for the Firefox. Then back to the normal 0.6/0.89Mbit/s.
Is there anything more that I can do? Pleas bear in mind that both Netscape and Explorer are working perfectly and I do not receive any error messages.
I tried (2) and unchecked the box but it did not help much, at times the reciving speed increased to about 1.2Mbit/s. BTW Netscape 9 is working perfectly with the same Flash version. Should not any problems with Flash also affect Netscape?
As for (1), I did find the file mms.cfg but please pardon my ignorance: How do I add the line "ProtectedMode=0" to it?
I also used diaxdiag to check the drivers but no troubles were detected.
Thank you cor-el but I did not have to try your suggestion.
Suggestion (1) by jscher2000 solved the problem completely - I think. I located the file mms.cfg in C:\Windows\System32\Macromed\Flash and copied it to the desktop. Open it with WordPad, added the line ProtectedMode=0 and saved it. Renamed the original file mms.cfgBAK (just in case I would need it later) and moved the new file to the same folder. Restarted Firefox and tested it several times - 7Mbit/s! Yezzzzzz!!!