As Apple reported at this year's online WWDC developer conference, the latest major version of macOS 11, dubbed Big Sur, also brings a number of innovations to Safari – the list is now expanded with another important item, as the software's upcoming release includes
Although Safari itself has been supporting add-ons for some time, the ecosystem is quite poor compared to rival products like Firefox, Chrome, or just the new chrome-based Edge with which to build common ground. thanks you can also use the full range of Chrome add-ons. The main reason for the poor build is that Safari uses non-web-based add-ons that are built with native macOS and iOS technologies, which also greatly narrows the potential developer community.
To remedy this, Apple is now opening the doors of Safari to web add-ons, though not quite in the form we have become accustomed to from other players in the market. This is because developers need to package their add-ons for native apps to publish them in the App Store and go through Apple's approval processes – but these apps can be simple “placeholders” without having to have real functionality.
To support web add-ons, Apple is also releasing dedicated conversion tools in Xcode 12 to quickly port existing Firefox or Chrome add-ons to Safari-compliant formatting. This could significantly swell Apple's browser add-ons in the near future, making the software attractive to macOS users who have been reluctant to use Safari because of the restrained palette.