When I release an extension in the Chrome webstore, can I be sure that everyone who downloads and installs this extension has the same app ID (forever)?
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2yes. why you doubt? – Zig Mandel Oct 29 '16 at 14:03
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I changed the name of the directory the app was in and it immediately changed the id so I was not sure which circumstances affect the id. Thanks for the answer – Julius S. Oct 30 '16 at 05:22
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The id of an unpacked Chrome extension changes according to the directory name unless you specify a "key"
in the manifest.json. (see manifest and key)
Once published in the Chrome Web Store it will be assigned an id and a key that will not change.

Iván Nokonoko
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Relevant: [How is the Chrome Extension ID of an unpacked extension generated?](http://stackoverflow.com/a/26058672/934239) – Xan Oct 30 '16 at 11:10
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More relevant questions: [Obtaining Chrome Extension ID for development](https://stackoverflow.com/questions/23873623/obtaining-chrome-extension-id-for-development) and [How to change chrome packaged app id Or Why do we need key field in the manifest.json?](https://stackoverflow.com/questions/21497781/how-to-change-chrome-packaged-app-id-or-why-do-we-need-key-field-in-the-manifest) – Xan Oct 30 '16 at 11:12