The directory holding the manifest file can be added as an extension in developer mode in its current state.
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Open the Extension Management page by navigating to chrome://extensions.
- The Extension Management page can also be opened by clicking on the Chrome menu, hovering over More Tools then selecting Extensions.
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Enable Developer Mode by clicking the toggle switch next to Developer mode.
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Click the LOAD UNPACKED button and select the extension directory.
Ta-da! The extension has been successfully installed.