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CloseReview for Firesizer by RealityRipple
Rated 5 out of 5 stars
Very useful for checking screen sizes in web development. Also gives you the size of the window, which can be useful for determining the exact minimum size a screen needs to be.
This review is for a previous version of the add-on (0.53).To create your own collections, you must have a Mozilla Add-ons account.