Separate Security Issue: Update your Flash Player or remove it using these links;
Uninstall Flash Player | Windows {web link}
Uninstall Flash Player | Mac {web link}

Note: Windows users should download the
ActiveX for Internet Explorer. and the plugin for
Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in
flash players and Adobe will cause a conflict. Install
the plugin only. Not the ActiveX.

Flash Player Version: 32.0.0.344

https://get.adobe.com/flashpl.183ayer/
Direct link scans current system and browser
Note: Other software is offered in the download. <Windows Only>

https://get.adobe.com/flashplayer/otherversions/
Step 1: Select Operating System
Step 2: Select A Version (Firefox, Win IE . . . .)
Note: Other software is offered in the download. <Windows Only>
+++++++++++++++++++++++++++++++++++
See if there are updates for your graphics drivers
https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

It has become impossible to drag the URL from the address bar to the desktop.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

JA said

It has become impossible to drag the URL from the address bar to the desktop.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

The problem does not recur in Safe Mode. Thank you. So I'll be working on troubleshooting which add-on is causing the problem.

I'm not sure if an add-on could case this ti happen.
This could be hardware acceleration in Firefox or possibly a permission or sandbox issue.

You can set this pref to 3 or lower on the about:config page to reduce the sandbox security level.

• security.sandbox.content.level = 3 (or 2 or 1)
• close and restart Firefox to make the change effective.

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

See also:

• https://wiki.mozilla.org/Security/Sandbox#Content_Levels

I can drag URL from address bar to deskto, it open the site but the icon is empty.

what can i do?

thanks a lot