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I just upgraded Firefox to the latest version to date (23) and while I can see the new logo, I can't find the share button. I tried with all add-ons disabled, but nothing changed. I tried to custom my toolbars, but there was no appropriate button in the proposed stack.

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Well, firefox is a browser, not a file manager to share something from it. I don't remember seeing ever such a button integrated in a browser. Anyway, what do you want to share from firefox and where? – Radu Rădeanu Aug 7 '13 at 11:16
@RaduRădeanu Firefox 23 comes with this button, see… – Chris Aug 8 '13 at 5:54
@Chris Well, the OP didn't mention nothing about a share button for Facebook. Anyway, I see this thing disgusting if I will see that button by default in my Firefox... – Radu Rădeanu Aug 8 '13 at 6:05
It was said in the press release that a new "Social API" was introduced, which enables such Add-Ons to integrate deeper into the Browser (show new messages count for instance).. There was not said they had added a facebook button, but some blogs wrote it in a way, that you could get the impression that firefox implemented a facebook button only, instead of an API. – mondjunge Aug 15 '13 at 14:48
up vote 4 down vote accepted

You first need to visit this page which tells you how to install "Messenger for Firefox". Only after that will you see the "social" button. And there's a video here:

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vasa1 is right. You will have to enable Messenger for Firefox in order to see the built-in share button. Firefox should have informed this by means of a popup, once the browser updated to 23.0

Here's a helpful tutorial with screenshots which will show you how to enable the built-on share

Enable Built-In Share in Firefox 23

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