You can log in to the Google Chrome plugin directly on the ATS Recruitis page. If you are on any page in ATS Recruitis, just click on the plugin icon and in the dialog that appears, click on the "Sign in with Recruitis" button. From that moment on, you are logged into the plugin and can use it on the sites it supports (LinkedIn, Teamio, Startupjobs, etc.).
This has an advantage in the case of alternative login methods (Google authentication, SAML, etc.), but also in the name / password variant, because you do not have to enter the password again.