Hello Len Karpinski,
Jun 23, 2003 Safari is a web browser developed by Apple Computer, Inc. And available as part of its Mac OS X operating system. It was included as the default browser in Mac OS X v10.3 (Panther) and is the only browser bundled with Mac OS X v10.4 (Tiger).
Thanks for the post in Apple Support Communities! I use extended desktop all the time myself, and I see you want to know if you can stretch a window to fill both displays. I'm glad to provide an answer.
This can be done by disabling the 'Displays have separate Spaces' checkbox in System Preferences > Mission Control. More information on the other effects of this can be found here: Change Mission Control preferences on Mac
Once you've disabled this option, you can place a window in one corner, then drag the opposite corner of that window to the opposite corner of your second display.
Cheers.
Mar 31, 2020 12:44 PM
Safari extensions add functionality to Safari, so you can explore the web the way you want. Extensions can show helpful information about a webpage, display news headlines, help you use your favorite services, change the appearance of webpages, and much more. Extensions are a great way to personalize your browsing experience.
Use the App Store to conveniently download and install Safari extensions. All extensions in the App Store are reviewed, signed, and hosted by Apple for your security.
Start by installing the latest macOS updates to make sure that Safari is up to date. You need Safari 12 or later to get Safari extensions from the App Store.
Find and install an extension:
Then return to Safari to turn on the extension you installed:
All extensions installed from the App Store are automatically kept up to date.
Choose Safari > Preferences, then click Extensions.
Safari no longer supports most web plug-ins. To load webpages more quickly, save energy, and strengthen security, Safari is optimized for content that uses the HTML5 web standard, which doesn't require a plug-in. To enhance and customize your browsing experience, use Safari extensions instead of web plug-ins.