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How does one install an extension for Chrome browser from the local file system?

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Found a set of instructions online for your own custom extension.

Navigate to chrome://extensions
Expand the developer dropdown menu and click "Load Unpacked Extension"
Navigate to local folder
Assuming there are no errors, the extension should load into your browser
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Ok, updated the answer to include the correct way to upload extensions into your browser. I tested it on my own and it worked. – paradd0x Feb 18 '11 at 21:50
Here is the link from where I got those instructions.… – paradd0x Feb 18 '11 at 21:52
If this worked for you, please mark it as an answer! Thanks! – paradd0x Feb 19 '11 at 4:27
Thanks. Gots to click the "Developer" check box nowadays, too – Kirby May 27 at 18:05

What kind of extension is it? Is it a .CRX file? A (possibly ZIP’d) folder? A .JS user-script? The process differs for each.

  • CRX:
    1. Drag and drop the .CRX file onto the page chrome://extensions
    2. Click the Install button in the prompt at the bottom of the screen

  • Folder:
    1. If it is ZIP’d, extract the contents somewhere
    2. In Chrome, open chrome://extensions/
    3. Click + Developer mode
    4. Click Load unpacked extension…
    5. Navigate to the extension’s folder and click OK
    6. Delete the (extracted) folder (the extension was copied)

  • User Script:
    1. Exit Chrome (all windows)
    2. Copy the .JS file to the User Scripts folder in your User Data folder
    3. Run Chrome
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Chrome doesn't by default allow you to install custom .crx extensions anymore. There must be an option for this, but I can't seem to find it. – agnoster Oct 17 '12 at 14:09
@agnoster, you can still use extensions from other than the webstore, but you must drop it into chrome://extensions now. – Synetech Oct 17 '12 at 18:12
@Synetech - Is this still a valid way? Can I use this to migrate extensions not available on App Store to new PC? – Alex S Aug 20 '15 at 11:39
Very nice @Synetech! That solved it for me. – EnocNRoll - Ananda Pardue Apr 6 at 19:21

To install a user script, the file must have a suffix of .user, like my_script.user.js.

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