I found that after Firefox v29, a LOT of my settings and
add-ons were changed / reset. Try this; Start Firefox in Safe Mode
While you are in safe mode;
Firefox Options > Advanced > General.
Look for and turn off Use Hardware Acceleration.
Then check ALL of your settings. Browser and add-ons. Then restart.

Also check out

RightToClick
Stops javascript annoyances such as forbidden right click, forbidden text selection or cascading dialog boxes.

Tried both options. It doesn't work. When I try to cut and paste, Firefoz sends the following message: "Copy/cut/paste is not available in Mozilla and Firefox. Do you want more information about this issue?"

Give us a snap shot. Also, try to copy the link address and post it here.

Hello,

In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see How do I create a screenshot of my problem?

Once you've done this, attach the saved screenshot file to your forum post by clicking the Browse... button below the Post your reply box. This will help us to visualize the problem.

Thank you!

Support for CAPS to enable the clipboard via user.js has been removed in Firefox 29.

See also:

• /questions/994091 Firefox 28 not working with NoScript local files file:///C:/....html

(edit: fixed link: question -> questions)

cor-el;

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Please, try searching our site using the form below

Sorry, the 's' in the questions got lost.

I have reopened a bug to add back the clipboard access. For the meantime, you can instead use Firefox ESR to continue using the functionality.

Hello,

Sorry for taking so long in responding. Here is the screenshot. Hope that helps to find a solution.

You can no longer do this via buttons that use JavaScript to do the copy/paste.
You can only do this via the keyboard.

Use keyboard shortcuts if the buttons on the web page or other methods aren't working.

• Copy: Ctrl+C or Ctrl+Insert (Mac: Command + C)
• Paste: Ctrl+V or Shift+Insert (Mac: Command + V)
• Cut: Ctrl+X or Shift+Delete (Mac: Command + X)

See also:

• https://developer.mozilla.org/en-US/Firefox/Releases/29/Site_Compatibility#Security

Cor-El, I followed your advice. It worked! Thank you so much!