On focus event, my content script is searching for some properties in
the DOM object of currently selected tab. If property found, it will
send a message to background page to show "available" browser action
icon. If property not found, show "unavailable" icon. The problem is
that some web pages fire multiple focus events. If the last DOM dose
not contain the property, my icon becomes "unavailable" although the
web page has the property I'm looking for. Any suggestions? Thanks in
advance.
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