For the record, "Chromium" class (or "Chrome") will not work for Chrome browser.
Corresponding classes are "Google-chrome-stable", and presumably "Google-chrome-beta", "Google-chrome-unstable".
So for Chrome, the needed filter is "& !(class=^Google-chrome)".
For the record, "Chromium" class (or "Chrome") will not work for Chrome browser.
Corresponding classes are "Google- chrome- stable" , and presumably "Google- chrome- beta", "Google- chrome- unstable" .
So for Chrome, the needed filter is "& !(class= ^Google- chrome) ".