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Bah. Since the last update Firefox is behaving poorly. When starting or opening a tab, the mouse freezes until Firefox/tab has loaded. Then it freezes for a fraction of a second while the page loads. On my systems it only takes a second or so, but it's annoying.
Other programs don't freeze the cursor when starting or updating.... except... Thunderbird.
Besides a compact theme and an adblocker with a whitelist for often-visited sites, I have no extensions installed; even so, disabling both doesn't help.
The only conclusion I can draw is that 'something' has changed in Mozilla's XUL framework.
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