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Extensions 
Chrome
Web store -
Chrome Extension PageDeleted from Chrome Web store
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Total Number of Extension users:237 +
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Reviewed by :13 Chrome Users
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Author Name:futuresight.org
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seamlessly switch between your scratch accounts.
This is a browser extension that will allow you to be able to switch between multiple scratch accounts easily.
To add the currently open account to the list of accounts, just open the popup while that user is logged in.
When logging out of Scratch, use the button in the extension popup rather than the one on the site, or the saved login for that user will no longer work.
To switch between accounts, click on the extension icon and then select the account you wish to access.
Scratch Multi Sign-on is deleted from https://chrome.google.com/webstore/. Previously it is on chrome store,its urls is https://chrome.google.com/webstore/detail/scratch-multi-sign-on/dpnpfjidmdpfpcbolljkbkmehfjamlof
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Enables Scratch hardware extensions on Chrome. Requires the Scratch Device Plugin.
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for Scratchers who want to compete in AtCoder
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Use Scratch JS plugins easily on Scratch 2.0
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Replaces the Scratch Search on the website
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turns every New Tab into a scratch pad
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Get help in Scratch projects with a live coding tutor from BlockSchool -- whenever you need it!
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Scratch3.0 のブロックの色を変える
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Vinyl Scratch makes the best beats.
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For Scratch teacher and book creator, downloading Scratch blocks to SVG file. Supports MakeCode for micro:bit.
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Scratchでバグの原因になりやすい全角数字を検知して赤文字にします。