Hello,

Thank you for contacting Mozilla. I understand that you are having problems with watching videos. In order to better understand and investigate on the issue that you are encountering, please reply to this message with the following information:

• What is the model of your phone?

Information page? Please visit this link if you need help finding the Build ID of your phone. 

• Please provide the exact steps to reproduce the issue you are encountering.
• Who is your current cell phone carrier?

Please be sure to include as much detail as possible, including any websites that may exhibit this issue, and any error messages that you may be receiving, exactly as they appear. This will ensure that we will have all the information needed to investigate into this. Thank you for your help and we look forward to hearing from you!

I have the same problem using Fx 4.2. See https://support.mozilla.org/en-US/questions/1038039. There have been at least 6 posts in this forum in the last week on this issue. It appears that Flash is no longer working on Firefox.

It should be fixed now https://bugzilla.mozilla.org/show_bug.cgi?id=1112086#c23

Note that Bugzilla is Not a discussion forum like here.