1929654 - Smartblock instagram placeholders not reloading on some sites

Status: VERIFIED FIXED

(Core :: Privacy: Anti-Tracking, defect)

Description

[William Wen (:wwen)]

On some sites, instagram embeds don't load properly even after unblocking the network request. Looks like a weird interaction with the facebook sdk shim.

At the beginning of the instagram embed script, there is a check that goes like: (FB.window && !FB.window.__buffer) || {<rest of script>}. The facebook sdk shim defines FB.window but does not add in the __buffer and causes the check to fail and the rest of the script to not run. The breakage is also recent so it may be a change on the instagram side?

Example site: https://ruby-shimmering-hair.glitch.me/

Comment 1

[William Wen (:wwen)]

Attachment: Bug 1929654 - Add __buffer as a field of window.FB in the facebook SDK shim. r=twisniewski

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/33cf51de14ed
Add __buffer as a field of window.FB in the facebook SDK shim. r=twisniewski,webcompat-reviewers

Comment 3

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/33cf51de14ed

Comment 4

[Negritas Sergiu, Desktop QA]

Hello! I can confirm that the issue is fixed with firefox 135.0a1(2024-12-09) on Ubuntu 22.04, MacOS 15.2 and Windows 10.

I will mark this issue as verified