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I'd like to have Firefox automatically check for updates for itself and any add-ons, but only once or twice a week, not every time it starts up. Is there a way to configure firefox this way? Thanks!

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up vote 6 down vote accepted

app.update.interval (Integer). The value entered here specifies the amount of time, in seconds, that Firefox waits before checking for updates. The default being 86400, aka 1 day. Of late the main Firefox releases have been due to security issues and as such it would be wise to leave this at the default to ensure you get notified of such updates ASAP.

Just open about:config page in address bar, enter app.update.interval and change the value accordingly.

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...which also implies Firefox does not really check every time it's started, but only once a day. (The comment about security updates surely makes me not want to change that to more than a day.) – Arjan Sep 19 '10 at 15:54

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