Can you create a new bookmark on the Bookmarks Toolbar via the right-click context menu?

Are there any other bookmarks visible on the Bookmarks Toolbar?

Check that "Bookmarks Toolbar items" is on the Bookmarks Toolbar

• Firefox menu button > Options > Toolbar Layout
• View > Toolbars > Customize
• if "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette into the Customize window to the Bookmarks Toolbar

• if missing items are in the toolbar palette then drag them back from the Customize window on the toolbar
• if you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar setup

Thanks, that was somewhat helpful - it actually got the page where the bookmarklet lives to show up on the toolbar. Unfortunately, I still can't get the thing to work. I'm waiting for the Flipboard guys to get back to me with suggestions.

I appreciate the assist - it got at least half the problem solved.

The bookmarklet tries to open a pop-up window.

I get a pop-up that opens the login page.

• https://share.flipboard.com/u/login?done=/bookmarklet/popout?v=2&title=Flipboard&url=https://share.flipboard.com/&t=1390930979228&fromBookmarklet=1

It is possible that you run into this pop-up maximum (the default value is 20).

• http://kb.mozillazine.org/dom.popup_maximum

You can open the about:config page via the location bar

• http://kb.mozillazine.org/about:config

You can inspect and manage the permissions for all domains on the about:permissions page or for the domain in the currently selected tab via these steps:

• Click the "Site Identity Button" (globe/padlock) on the location bar
• Click "More Information" to open "Page Info > Security"

• Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions for the domain in the currently selected tab