How to download Chrome extensions for installing in another computer?

A computer I use does not have access to the https://chrome.google.com/extensions website.

I wish I could download the plugin and then use the file to install it, but the only option I have is to install. The plugin is downloaded to a temporary folder with a random name, and I'm not able to identify it.

Answer

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.

1. 
   

   Go to Chrome's Extensions page (chrome://extensions/)

   
   


2. 
   

   Enable the developer mode (check the developer mode box)

   
   

   

   
   


3. 
   

   Click on the "Pack extension" button. Give the "Extension root directory" as ~/.config/google-chrome/Default/Extensions/$ID$ for ubuntu, C:\Users\\AppData\Local\Google\Chrome\User Data\Default\$ID$ for windows, ~/Library/Application Support/Google/Chrome/Default\$ID$ for OS X. 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 ~/.config/google-chrome/Default/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)