Comment 18 for bug 606956

Just wanted to add one final thing. Unless I am mistaken, when you use Chrome/Chromium's "load unpacked extension" and choose the "chrome_extension" directory, the browser does not copy the extension files to anywhere else but continues to use them from that directory, so if you delete it you'll no longer have the extension.

So make sure you first put the extension somewhere it can stay (I put it in ~/.config/chromium/Default/Extensions/rescuetime-linux-uploader-extension/). I had to delete ~/.rescuetime/google-chrome_extension-id.txt again after losing the extension and unpacking it again. Then it worked.