Steps to reproduce:
Please install the attached test extension and open the console of background page (Chrome just click "background page" and Firefox "Inspect") and the options page. Neither "browser" nor "chrome" variable is given.
"Browser" (or "chrome") variable is essential for extensions to work. Currently I can confirm only that it is working for new tab pages defined by chrome_url_overrides.newtab w/o prob, but not for background and option pages. I have no idea why the background page of 1Password is working but not for this test.
Orion and macOS:
0.99.107.14-beta (WebKit 613.1.8)