Firefox no longer recognizes wireless printer! HELP!

As others have posted numerous times, I am no longer able to print from my Canon MX340 printer. All was fine until I updated Firefox a couple of weeks ago. The printer works PERFECTLY AS IT SHOULD from Internet Explorer, Google, Iron browsers, so it HAS to do something with Firefox. and NOT the printer.
I have already tried to reset the printer settings in about:config as suggested by many, but this does NOT solve the problem. I have also uninstalled and reinstalled Firefox, but this does nothing to solve the printer issue either.
Would you PLEASE tell me, as well as the many others having this same issue, how this is to be resolved or if we'll have to wait until the next update to see any change? I really don't want to go back to using Internet Explorer!
Thank you in advance for your reply! :)

i have recommended this procedure because quite a few other users have reported that the printer dialog doesn't show up with firefox 27 and up and avast. many antivirus programs still stay active in the background even if their UI shows them as disabled - so i think it's better to test it by uninstalling avast. after a restart it should be immediately apparent if printing works again in firefox.

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    Message was edited by: Pdlhed

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