For regular Windows users who are not skilled with computers, it is practically not possible to install and use extensions from outside the Chrome Web Store.
Users of other operating systems (Linux, Mac, Chrome OS) can easily install unpacked extensions (in developer mode).
Windows users can also load an unpacked extension, but they will always see an information bubble with "Disable developer mode extensions" when they start Chrome or open a new incognito window, which is really annoying. The only way for Windows users to use unpacked extensions without such dialogs is to switch to Chrome on the developer channel, by installing https://www.google.com/chrome/browser/index.html?extra=devchannel#eula.
Extensions can be loaded in unpacked mode by following the following steps:
- Visit
chrome://extensions(via omnibox or menu -> Tools -> Extensions). - Enable Developer mode by ticking the checkbox in the upper-right corner.
- Click on the "Load unpacked extension..." button.
- Select the directory containing your unpacked extension.
If you have a crx file, then it needs to be extracted first. CRX files are zip files with a different header. Any capable zip program should be able to open it. If you don't have such a program, I recommend 7-zip.
These steps will work for almost every extension, except extensions that rely on their extension ID. If you use the previous method, you will get an extension with a random extension ID. If it is important to preserve the extension ID, then you need to know the public key of your CRX file and insert this in your manifest.json. I have previously given a detailed explanation on how to get and use this key at https://stackoverflow.com/a/21500707.
Answer from Rob W on Stack OverflowVideos
For regular Windows users who are not skilled with computers, it is practically not possible to install and use extensions from outside the Chrome Web Store.
Users of other operating systems (Linux, Mac, Chrome OS) can easily install unpacked extensions (in developer mode).
Windows users can also load an unpacked extension, but they will always see an information bubble with "Disable developer mode extensions" when they start Chrome or open a new incognito window, which is really annoying. The only way for Windows users to use unpacked extensions without such dialogs is to switch to Chrome on the developer channel, by installing https://www.google.com/chrome/browser/index.html?extra=devchannel#eula.
Extensions can be loaded in unpacked mode by following the following steps:
- Visit
chrome://extensions(via omnibox or menu -> Tools -> Extensions). - Enable Developer mode by ticking the checkbox in the upper-right corner.
- Click on the "Load unpacked extension..." button.
- Select the directory containing your unpacked extension.
If you have a crx file, then it needs to be extracted first. CRX files are zip files with a different header. Any capable zip program should be able to open it. If you don't have such a program, I recommend 7-zip.
These steps will work for almost every extension, except extensions that rely on their extension ID. If you use the previous method, you will get an extension with a random extension ID. If it is important to preserve the extension ID, then you need to know the public key of your CRX file and insert this in your manifest.json. I have previously given a detailed explanation on how to get and use this key at https://stackoverflow.com/a/21500707.
For Windows, you can also whitelist your extension through Windows policies. The full steps are details in this answer, but there are quicker steps:
- Create the registry key
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallAllowlist. - For each extension you want to whitelist, add a string value whose name should be a sequence number (starting at 1) and value is the extension ID.
For instance, in order to whitelist 2 extensions with ID aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa and bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb, create a string value with name 1 and value aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, and a second value with name 2 and value bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb. This can be sum up by this registry file:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome]
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallAllowlist]
"1"="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"2"="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
EDIT: actually, Chromium docs also indicate how to do it for other OS.
EDIT (06/05/2022): ExtensionInstallWhitelist is deprecated since Chrome 100, it has been renamed to ExtensionInstallAllowlist (answer updated)
Ok. I just found out that the accepted answer's method is not working. It was actually working a few months back. So, when I came here to copy the link (I had forgotten) I found that its not working. Here's what I did to get the CRX file.
Note: You will need the Chrome Extensions's ID for this. I am referring it to as $ID$. You can get the $ID$ from the URL of the Chrome Extension page.
Go to Chrome's Extensions page (chrome://extensions/)
Enable the developer mode (check the developer mode box)
Click on the "Pack extension" button. Give the "Extension root directory" as:
a. Unix, ~/.config/google-chrome/Default/Extensions/$ID$
b. Windows, C:\Users\<Your_User_Name>\AppData\Local\Google\Chrome\User Data\Default\Extensions\$ID$
c. OSX, ~/Library/Application Support/Google/Chrome/Default/Extensions/$ID$
Leave the "Private Key" field blank" and click "Pack extension".
You will find the .CRX file in the same directory as ~/.config/google-chrome/Default/Extensions/$ID$ (or other respective directories for Windows and OS X)
(Note: The .CRX file is just a .ZIP file. If all you want to do is to extract extension after getting it, you can just find the unpacked extension at <previous folder>/Extensions/$ID$ you don't need to follow above steps. You would need to follow above steps only if you specifically need the .CRX file)
I've wondered how to do this too. I found this blog article that has the solution (I edited it to bring it up-to-date):
- Find the ID of the extension you’re interested in. When on the details page of the extension, it will be something like
bfbmjmiodbnnpllbbbfblcplfjjepjdnafterhttps://chrome.google.com/webstore/detail/ - Paste this into Firefox (not Chrome):
https://clients2.google.com/service/update2/crx?response=redirect&os=win&arch=x64&os_arch=x86_64&nacl_arch=x86-64&prod=chromiumcrx&prodchannel=beta&prodversion=79.0.3945.53&lang=ru&acceptformat=crx3&x=id%3D~~~~%26installsource%3Dondemand%26ucand replacing~~~~with the extension ID. - You’ll be prompted to save a CRX file. Drag this file to a Chrome window and proceed with installation
I want to try this extension from github(https://github.com/FaisalUmair/udemy-downloader-gui) but unable to install. Help would be much appreciated!
