>>loster+(OP)
Restart your browser and you will see the extension is no longer installed. This is deliberate on the part of Chrome (Firefox does this too) - It is to prevent malicious extensions from using the developer mode as a backdoor to install themselves.
On each restart, you will need to re-add the extension from source.
>>snowwo+X1
I've been needing to do this with the LastPass Chrome extension as well. It is rather annoying, but if you just keep the browser running it is bearable. I'll slowly switch back to Firefox though. They are adding sandboxing and swapping Gecko to a Rust-based engine. We'll see about the performance. Bottomline is, I'm done with being overly reliable on Google.