Export chrome plug-ins and import local plug-ins to chrome

The first is in the corresponding C:\Users\ThinkBook\AppData\Local\Google\Chrome\User Data\Default\Extensions Find the desired plug-in in the directory
According to the plug-in id affirmatory

Then there is the packaging of extensions

then , How to import it back ？
The first is to change the file attributes , hold crx File modification
I changed it to zip Format
Then in a folder , Decompress him

Then import it