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Strange Phone icon in FX 33

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When selecting customise, I have a blank icon in the available icons. If I drag it somewhere else in the list it turns into a phone icon (no text) and soon disappears if I try to add it anywhere. Is this some remnant of sync with Firefox on Android (don't use it) that is haunting my toolbars?

When selecting customise, I have a blank icon in the available icons. If I drag it somewhere else in the list it turns into a phone icon (no text) and soon disappears if I try to add it anywhere. Is this some remnant of sync with Firefox on Android (don't use it) that is haunting my toolbars?

All Replies (2)

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Here's a screenshot (no provision to do so in original post).

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That is the 'hello' button for WebRTC. This feature will be enabled in the next Firefox 34 version.