Currently, Safari and Firefox don't support installing PWAs.
Open Adobe Express on desktop web.
Select Account, and then select Install Adobe Express.
Select Install on the dialog box.
Once you’ve installed it, right-click the app and pin it to the taskbar for easy access.
Open Adobe Express on desktop web.
Select Account, and then select Install Adobe Express.
Select Install on the dialog box.
Open Adobe Express in Chrome.
Select the Install Adobe Express icon on the address bar and then select Install.
To pin Adobe Express to your Chromebook’s app shelf, open the Launcher in the corner of the screen, right-click on the Adobe Express app, and select Pin to Shelf.
