The solution can both prevent the pop-up warning and give you the permission to use some extensions not in the webstore. If you can use the develop mode extensions but suffer from the pop-up warning, it also can help you.
Seems that not only just warning you but chrome54 will also forcibly disable the .crx extensions not in the webstore now, in Windows.
D@mn give me liberty or give me death! Maybe only I suffered from it but it is still a sad story.
Firstly copy the ID of the forcibly-disabled extension. For example:
[ID]
Download " ZIP file of ADM/ADMX/JSON templates and documentation " from chromium website http://www.chromium.org/administrators/policy-templates . Extract and find windows\adm\<your-language>\chrome.adm . For example:
[Location]
Then press Win+R, running gpedit.msc.
[gpedit.msc]
Follow the steps shown in the following images (OMG it is boring to type)
[STEP 1]
[STEP 2]
[STEP 3]
[STEP 4]
Wait quite a few minutes. It takes a long time to load the ADM.
When finished, close the tab and open the setting marked in the following image:
[The setting]
Double click the setting:
[The setting]
Enable it. Click "show" and double-click the dialog, pasting the ID.
[finished]
[amazing]
Nothing annoyingly popping and nothing stops you to enjoy your freedom.Thank you Chromium!
It works for me and I hope it can also help you.
Anyway, if you just want to use the extension and don't care about the warning, you can extract the *.crx and load the unpacked extension. It works, only with a pop-up warning.
