You can add more rulesets by visiting the options page -- click the _Cogs_ icon in the popup panel.
uBOL is entirely declarative, meaning there is no need for a permanent uBOL process for the filtering to occur, and CSS/JS injection-based content filtering is performed reliably by the browser itself rather than by the extension. This means that uBOL itself does not consume CPU/memory resources while content blocking is ongoing -- uBOL's service worker process is required _only_ when you interact with the popup panel or the option pages.
uBOL does not require broad "read and modify data" permission at install time, hence its limited capabilities out of the box compared to uBlock Origin or other content blockers requiring broad "read and modify data" permissions at install time.
Neoazh ez eus tu deoc'h reiñ *sklaer* aotreoù ouzhpenn da uBOL el lec'hiennoù ma fell deoc'h, mod-se e vint silet gwelloc'h en ur implij siloù kened hag ensinkladurioù scriplet.
Evit reiñ aotreoù ouzhpenn da uBOL en ul lec'hienn bennak, n'ho peus nemet digeriñ ar prenestr pop-up ha diuzañ ul live silañ uheloc'h evel ar mod Gwellañ pe ar mod Klok
The browser will then warn you about the effects of granting the additional permissions requested by the extension on the current site, and you will have to tell the browser whether you accept or decline the request.
If you accept uBOL's request for additional permissions on the current site, it will be able to better filter content for the current site.
You can set the default filtering mode from uBOL's options page. If you pick the Optimal or Complete mode as the default one, you will need to grant uBOL the permission to read and modify data on all websites.
