Reference answers to various topics seen in the wild

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• Does uBO use service workers?
• Does uBO open tabs on its own?

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Does uBO use service workers?

No.

uBO doesn't use service workers, it uses dedicated workers -- and just for the time it needs it -- to avoid blocking the user interface while performing CPU-intensive tasks. For examples:

• To search strings in asset viewer
• To reverse-lookup lists in logger
• To apply patches in differential updater
• To serialize/unserialize large lists downloaded from remote servers and memory snapshots

_{https://old.reddit.com/r/uBlockOrigin/comments/1b36y1l/service_workers_should_i_continue_to_block/}

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Does uBO open tabs on its own?

No.

If a tab opens and uBO tells you that it blocked navigation to some URLs, something else than uBO opened the tab, and uBO merely blocked the navigation because of a filter from one of the filter lists matched.

Tabs can be created by websites or other extensions, uBO never ever creates a tab, except to its own internal pages and only when you specifically ask for it (for example when you click the "gear" icon in the popup panel.

_{https://old.reddit.com/r/uBlockOrigin/comments/1b3anva/why_is_ublock_origin_creating_pinned_tabs_in/}

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