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

Qqen
Tignit n uzegrir

Iceggiren i WindowSizer

WindowSizer sɣur Dr. Cheap

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Icegger-it revija
sɣur revija, 8 jierren lyn
Rather pointless without 'window position' property.

UPD. I see. Sure you have your reasons.

Tiririt n ineflayen

yeffeɣ-d deg 8 jierren lyn
There is already an addon that does that, yet it requires a position, which is often not desirable.