you don't need download artifact app-versions.json anymore!
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Download project (https://github.com/kdrdgn/bamboo-artifact-popup/archive/master.zip) and extract zip file.
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Visit chrome://extensions in your browser (or open up the Chrome menu by clicking the icon to the far right of the Omnibox: The menu's icon is three horizontal bars. and select Extensions under the Tools menu to get to the same place).
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Ensure that the Developer mode checkbox in the top right-hand corner is checked.
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Click Load unpacked extension… to pop up a file-selection dialog.
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Navigate to the directory in which your extension files live, and select it.
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Alternatively, you can drag and drop the directory where your extension files live onto chrome://extensions in your browser to load it.