How Do We Let Users Add Our Application As A Tab On Their Profile?

In your Application settings, ensure these are set: Canvas Canvas Page URL Canvas Callback URL Profiles Tab Name Tab URL The Tab request will go to {Canvas Callback URL}/{Tab URL}. Then something like this should work: apps.facebook.com/fbrelll/xfbml/fb:add-p... That's using the updated JS SDK. I can't post more links, but the developer site and github repository have useful information about the SDK.

In your Application settings, ensure these are set: Canvas > Canvas Page URL Canvas Callback URL Profiles > Tab Name Tab URL The Tab request will go to {Canvas Callback URL}/{Tab URL}. Then something like this should work: apps.facebook.com/fbrelll/xfbml/fb:add-p... That's using the updated JS SDK. I can't post more links, but the developer site and github repository have useful information about the SDK.

So we definitely have all of those settings filled out, and we are trying to use that tag. The button never renders, though, and the console just reports this "Unsafe JavaScript attempt to access frame with URL our app url on facebook from frame with URL URL our iframe loads from. Domains, protocols and ports must match." error.

– mbarnett Jul 10 '10 at 21:17 That error is a red herring -- WebKit is paranoid, and will log that "error" for legitimate use cases where a catch block should be consuming it. You'll notice this error even with my example where everything works as expected. Would be helpful to see a live repro case for your issue to see what's going on.

– daaku Jul 11 '10 at 2:50.

It turned out that simply doesn't render without the user having first allowed the app to connect to them via something like.

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