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I've figured this out with the help of the posters at MacScripter. (See https://macscripter.net/viewtopic.php?pid=210524#p210524.) The Orion beta does have AppleScript oddities and bugs. This is what worked: tell application "Orion" tell window index 1 make new tab with properties {URL:"https://twitter.com"} end tell end tell To also switch to the tab, this works: tell application "Orion"   tell window index 1     make new tab with properties {URL:"https://twitter.com"}     set tabcount to number of tabs     set myTab to tab tabcount     tell myTab       set tabName to its name     end tell     set current tab to first tab whose name is tabName   end tell end tell