To use these add-ons, you'll need to download Firefox.

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Iceggiren i PageProbe - Automatic Page Monitor

PageProbe - Automatic Page Monitor sɣur Nodetics

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Icegger-it Sed
sɣur Sed, neljä vuotta sitten
It works great!

Is it possible with a cron every 10 seconds? or is every minute the lowest setting?

I now use Task scheduler to start Firefox and kill FireFox for the short every 10 seconds probes I do daily.