* ⚠️ **This is a breaking change**: `ThumbnailStorage.saveThumbnail()` now takes an `ImageSaveRequest` instead of an `ImageRequest`.
* ⚠️ **This is a breaking change**: `ThumbnailStorage.loadThumbnail()` now takes an `ImageLoadRequest` instead of an `ImageRequest`.
***feature-addons**
* AddonManager now receives a `WebExtensionRuntime` instead of an `Engine`. This has no impact to consumers of `feature-addons` as `Engine` already implements `WebExtensionRuntime`.