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Clarify auto-generation of background service worker in Safari #40825

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rebloor merged 1 commit into from
Oct 12, 2025
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Clarify auto-generation of background service worker in Safari #40825

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4 changes: 3 additions & 1 deletion files/en-us/mozilla/add-ons/webextensions/manifest.json/background/index.md
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Expand Up @@ -185,7 +185,9 @@ Support for the `scripts`, `page`, and `service_worker` properties varies betwee
- `background.service_worker` is not supported (see [Firefox bug 1573659](https://bugzil.la/1573659)).
- supports `background.scripts` (or `background.page`) if `service_worker` is not specified or the service worker feature is disabled. Before Firefox 120, Firefox did not start the background page if `service_worker` was present (see [Firefox bug 1860304](https://bugzil.la/1860304)). From Firefox 121, the background page starts as expected, regardless of the presence of `service_worker`.
- Safari:
- supports `background.scripts` (or `background.page`) and `background.service_worker`. If both are specified, uses `background.scripts` (or `background.page`), unless `preferred_environment` is set to `service_worker`.
- supports `background.scripts` (or `background.page`) and `background.service_worker`.
- when both are specified, Safari uses `background.scripts` (or `background.page`) unless `preferred_environment` is set to `service_worker`.
- when `preferred_environment` is set to `service_worker` and `background.service_worker` isn't specified, Safari generates a service worker from `background.scripts` if present.

To illustrate, this is an example of a cross-browser extension that supports `scripts` and `service_worker`. The example has this manifest.json file:

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