I run Tbird 91.2.0/Linux & Firefox 94.0/Linux
In Firefox’s user.js I’ve set
user_pref("browser.link.open_newwindow", 3);
user_pref("browser.link.open_newwindow.restriction", 0);
user_pref("browser.link.open_newwindow.override.external", -1);
IIUC, with that config, links opened from other apps should open in new tabs in an existing/running instance of FF.
In a Tbird email, I’ve two links.
If I click on the 1st,
https://www.amazon.com/gp/your-account/ship-track?ie=UTF8&orderId=xxx-xxxxxxx-xxxxxx&packageIndex=0&shipmentId=xxxxxxxxx&ref_=scr_pt_tp_t
it behaves in exactly that way … opened in a new tab in existing FF instance.
But if I click on the 2nd,
http://wwwapps.ups.com/WebTracking/processInputRequest?HTMLVersion=5.0&loc=en_US&Requester=UPSHome&tracknum=1ZYxxxxxxxxxxxxxxx&AgreeToTermsAndConditions=yes&track.x=28&track.y=10
a new FF instance is launched, and the link is opened in a new, sized window in that new instance.
Why do the two TBird links behave differently with this config?
What do I need to change so that ALL Tbird links behave like the 1st one – opened in new tab in the existing/running instance of FF?