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this fixes #1257: toolbar button missing for new uBO install w/ Seamonkey 2.39
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@ -2751,7 +2751,10 @@ vAPI.toolbarButton = {
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break;
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}
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if ( document.getElementById(tbb.id) !== null ) {
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// https://github.com/gorhill/uBlock/issues/763
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// We are done if our toolbar button is already installed in one of the
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// toolbar.
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if ( palette !== null && toolbarButton.parentElement !== palette ) {
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return;
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}
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