This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

YouTube address wasn't understood

  • 3 replies
  • 21 have this problem
  • 26 views
  • Last reply by JaineyCakes

more options

The address wasn't understood

Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program.

 You might need to install other software to open this address.
The address wasn't understood Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program. You might need to install other software to open this address.

All Replies (3)

more options

Could your provide the url

Hello,

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

  • You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
  • Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you.

more options

try using real player,it has plugin for watching rstp file.

more options

I'm sorry, but that was half a month ago. I am still having issues in FF 21. I suppose I'll have the issue again, but hopefully it won't be a month from now.

Thank you for your efforts, tho. I truly appreciate a response.