I am struggling with an issue involving two files: manifest.json and content.js. After compressing both files into a Zip format, I converted them into CRX format. However, when attempting to install the .crx file in Google Chrome by dragging and dropping it into the browser, I encountered an alert message stating "CRX_MAGIC_NUMBER_INVALID."
Can anyone provide insight on how to resolve this problem?
In order to download extensions from the Web Store now, you must be signed into your Google account. It may seem silly, but this is currently the necessary step. Source.
A friend of mine encountered the same issue when trying to install a homebrew extension. The solution provided should help resolve your problem as well.
Chrome offers a convenient pack extension feature. Simply navigate to the manage extensions section and you'll find this option there. It will generate the necessary .crx file for you.
If not, you always have the option of accomplishing this task with a batch file
cd /d C:\Users\[username]\AppData\Local\Google\Chrome\Application
chrome --pack-extension="[extension folder path]" --no-message-box
Your CRX file may be experiencing issues due to its format. The code
searches for a specific "magic number" at the beginning of the file, as explained in detail here
http://code.google.com/chrome/extensions/crx.html
It seems that compressing your extension and changing its file extension to crx may not always work properly. This could be related to the zip tool being used. A similar issue is discussed in this thread along with potential solutions.
http://groups.google.com/a/chromium.org/group/chromium-apps/browse_thread/thread/1785b46c2998af2c
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