I have found myself in identical situation today...
On Tuesday, November 4, 2014 8:06:48 PM UTC+1, ChrisW wrote:
>
> I'm encountering the exact same issue on Firefox 31 ESR (31.2.0) on RHEL
> 6.6. No toolbar button, F12 brings up the Firefox developer tools, no way
> to add the toolbar button back, no option in the Tools menu.
>
> Installed FBTrace and disabled all other addons besides that and FB and
> still no button. I did get some errors in FBTrace:
>
> 2
>
> mini-require; ERROR Could be a cycle dependency or undefined return value
> from a module: firebug/firefox/browserOverlay
> 3
>
> Console Service ERROR [JavaScript Error: "[Exception... "Component
> returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED)
> [nsIPrefBranch.getCharPref]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)"
> location: "JS frame :: chrome://firebug/content/firefox/browserOverlay.js
> :: <TOP_LEVEL> :: line 46" data: no]" {file:
> "resource://firebug/mini-require.js" line: 92}] [JavaScript Error:
> "[Exception...
> 4
>
> Console Service ERROR [JavaScript Error: "BrowserOverlay is not a
> constructor" {file: "resource://firebug/loader.js" line: 171}] [JavaScript
> Error: "BrowserOverlay is not a constructor" {file:
> "resource://firebug/loader.js" line: 171}]
>
>
>
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