As of bug 497973, tabbrowser doesn't listen to the UpdatedScrollButtonsDisabledState event anymore. It doesn't seem universally useful, so we should get rid of it. It's still used in comm-central, but that's only because tabmail.xml is a tabbrowser.xml fork.
SeaMonkey's themes don't actually look at the disabled state of scrollbutton-down-box, so they are unaffected. As for Thunderbird, only qute looks for .scrollbutton-down-box[disabled="true"]. Searching in extensions yields a single result, <https://addons.mozilla.org/en-US/firefox/addon/7849>, which copied the entire tabbrowser.xml.
Created attachment 406197 [details] [diff] [review] patch
Assignee: nobody → dao
Status: NEW → ASSIGNED
Attachment #406197 - Flags: review?(enndeakin)
Status: ASSIGNED → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla1.9.3a1
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