Hi, thanks for your reply:

I have the first foto. If i click onthe icon then I become your second foto. only with pdf I become an (buggy) EMPTY foto (i.e. a window without "allow or deny").

with noscript its unuseful /redondant to see Allow or Deny, because noscript alredy allowed it! a further interaction is needed only with pdf : this interaction, after Ok in noscript, is => reload the page. not good.

My purpose is not to resolve the bug of empty popup (your second foto, but without letters, only grey popup: this happens on some sites and if you dont REload the page with pdf, with noscript, or if the page uses more than one plugin), my purpose is to search a key in about:config to get the icon (first foto, left to the globe, the new icon like a car battery) to disappear, and if this icon/this feature will disappear I will not see the popup in the second foto.

thank you for your patience, much appreciated. I come back tomorrow. thanks. regards.

although its not my "main problem" (because I want to refuse /extirpate this feature), just out of curiosity here the buggy window http://postimg.org/image/tahoqym59/

Hi anuswara, you can hide the gray "lego" icon using a custom style rule. You can implement the rule using either (1) Stylish extension or (2) userChrome.css file. This is simply hiding the icon you do not need, and does not require click-to-play on or off.

Style rule (may need to change left or right margin to -6px depending on your specific toolbar layout):

@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
/* Gray icon saying plugin is active and providing option to block */
#plugins-notification-icon{
  width: 0px !important;
  margin-left: -5px !important;
  margin-right: -5px !important;
}

This should not affect other notifications in that area of the address bar.

If you decide you want to remove a site's permission to run a plugin but still allow scripts, you can block the plugin on the Permissions tab of the Page Info dialog. To call up that dialog, you can choose one of these methods:

• Click the site identity icon (globe or padlock) > More Information
• Right-click the page > View Page Info
• Tools menu > Page Info

Related discussion: How to get rid of plugin in use lego icon?

Hi anuswara, you wrote:

You will need one additional click for pdf.

Are you using the Adobe Acrobat plugin instead of the built-in PDF viewer (based on pdf.js)? On the Add-ons page, make sure the Acrobat plugin is set to "Always Activate" to bypass having to enable the plugin on a page-by-page basis.

hey jscher2000 I warmly thank you for your solution!!

yes, I am using Adobe Acrobat plugin, yes always activate. when I had the lego icon + noscript, I made this: click on a link with pdf pdf was blocked by noscript click OK in noscript (and stop, until ff23). with ff24 (icon lego, before your solution) I had to add this task:

reload the (blank) page. at this point I saw the pdf. also with the lego icon (+ noscript) I needed to click "reload page" otherwise I had blank page.