Find the ID you noted earlier and double-click it.
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12. Access the folder inside by double clicking on it. In this example, it's 1.0.10_0.
13. In the address bar, click the down arrow icon to see the path to this particular folder.
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14. Select it, right-click, then select Copy.
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15. On the Extensions page in Chrome, click the Pack extension button.
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16. This action will open a pop-up window. Paste the link you copied in step 14. You can omit the Private key field. Click the Pack extension button.
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17. A pop-up window will let you know that the extension has been converted to the new file format. A main file with the PEM extension has also been created. Click OK to continue.
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18. If you reopen the extension folder, you will see the CRX file.
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If you find the above method a bit complicated, don't worry. There is a simpler way to convert your extension to a CRX file. You have to download another extension to save as CRX directly from your browser.
1. Download the CRX Extractor/Downloader extension in your Chrome browser.
2. In the Chrome Web Store, navigate to the extension that you want to convert to a CRX file.
3. Click the Extension button in the browser next to the address bar and select CRX Extractor/Downloader.
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4. A pop-up window will appear with three options. Click Download as CRX .
The CRX file should now be available in your Downloads folder.