Tab titles display as "null" if Send Tab URLs invoked after browser session was restored

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The reason why the tab titles can't be retrieved is that Send Tab URLs currently looks at the document.title property within each browser tab. But this property is inaccessible after the browser session is restored because Firefox doesn't automatically reload the content in the inactive tab browsers; that is only done when the user clicks on a browser tab.

This issue is most noticable if the user has installed Panic Button, and has set the Panic Button action to either "Hide all windows" or "Hide and replace."

There was an attempt at fixing this issue in 2.1.1 which had a side effect of causing a blank browser tab to open when clicking on a link in a Gmail message (which is the reason why version 2.1.1 is no longer publicly available).

After digging around in the DOM Inspector in Firefox 27, I found a better way. The browser overlay code should do something similar to this:

let browserTabs = document.getElementById("tabbrowser-tabs").tabbrowser.tabs;
let tabTitle = browserTabs[i].label;   // where i is between 0 and browserTabs.length

Whatever approach is taken needs to be compatible with the Hide Tab Bar With One Tab extension.

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This fix is confirmed to be working with Hide Tab Bar With One Tab, version 1.4. Tested on Firefox 30.

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Fixed in 2.2