Install Google extensions offline

Fix the "Install this program from Chrome Web Store Only" method

5. After checking the developer mode option, a button such as loading the extension that is being developed will appear on this page, click the "load the expanding program being developed" button and select the location of the Chrome plugin folder just unzipped,

7. In this situation, Chrome will not be able to load extensions from the following sources: the XXX path (the decompression location of the chrome plugin file) cannot load extension with file or directory name _metadata. Filenames starting with "_" is reserved for use by the System. This occurs because the chrome plugin is somewhat incompatible with the new Chrome browser, when the user can open the Chrome plugin folder that was just unzipped and The name of the metadata folder is modified to metadata (remove the preceding underscore):

Http://chromecj.com/utilities/2015-04/423.html

Install Google extensions offline