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

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Iceggiren i Checker Plus for Google Calendar™

Checker Plus for Google Calendar™ sɣur Jason Savard

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Icegger-it Bflat
sɣur Bflat, neljä vuotta sitten
It's one of my favorite Firefox extensions for sure. The only issue I had with it is that the black font skin applies to everything but the agenda.