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Safari presidence for background pages and scripts #38635

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Safari presidence for background pages and scripts #38635

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Safari presidence for background pages and scripts
rebloor Mar 14, 2025
8ac6f34
Grammar fix
rebloor Mar 14, 2025
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3 changes: 1 addition & 2 deletions files/en-us/mozilla/add-ons/webextensions/manifest.json/background/index.md
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Expand Up @@ -186,8 +186,7 @@ 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.service_worker`.
- supports `background.scripts` (or `background.page`) if `service_worker` is not specified.
- 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`.
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In Safari (18+) only, if preferred_environment is set to service_worker AND background.service_worker is absent AND background.scripts is present, then these scripts are all executed in a service worker context. @xeenon should that be documented here? (Somewhere?)


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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