[R&D] Block sites using more generic tab title

[olfek]

https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/tabs/Tab#title

[olfek]

For example,
I could add the word "game" or "gaming" to the ruleset to block all websites with these words in the tab title.

[olfek]

Although, tab title may be unavailable at the chrome.webNavigation.onBeforeNavigate stage 🫤