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+[Back to Wiki Home](./Home)
+
+---
+
+### Does uBO use service workers?
+
+No.
+
+uBO doesn't use [service workers](https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker), it uses [dedicated workers](https://developer.mozilla.org/en-US/docs/Web/API/Worker/Worker) -- 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
+
+<sub><https://old.reddit.com/r/uBlockOrigin/comments/1b36y1l/service_workers_should_i_continue_to_block/></sub>
+
+---
+
+### 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.
+
+<sub>https://old.reddit.com/r/uBlockOrigin/comments/1b3anva/why_is_ublock_origin_creating_pinned_tabs_in/</sub>
+
+---