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

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Iceggiren i Simple maximize windows on start up

Simple maximize windows on start up sɣur Siarhei Kuzeyeu

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Icegger-it drtzevans
sɣur drtzevans, pred rokom
Does exactly what is needed; using with LibreWolf fork of Firefox which otherwise will not open maximized - this does the trick.
5 n yiceggiren