facebook.com - Newsfeed jumps and skips posts

[webcompat-bot]

URL: https://facebook.com

Browser / Version: Firefox 102.0
Operating System: Mac OS X 10.13
Tested Another Browser: Yes Safari

Problem type: Something else
Description: newsfeed jumps and skips posts
Steps to Reproduce:
reported it to facebook and they responded that its not a problem with their site

Browser Configuration

• None

From webcompat.com with ❤️

[ksy36]

Thanks for the report. I can't reproduce this, the posts load as expected for me.
This could be the same issue as #106729, so I'll keep it open.

[softvision-raul-bucata]

I was not able to reproduce the issue as well:

Screen.Recording.2022-07-06.at.15.33.49.mov

Tested with:

Browser / Version: Firefox Release 102.0 (64-bit)
Operating System: Mac OSX Catalina 10.15.7

Suggestion: Try clearing cache/data/cookies, disabling add-ons and Ad-blocker (if available) and extensions or use a clean profile, and check again? If there are any changes made to the default settings of the browser (e.g. in about:config) please revert to the default settings and try again. Also, have the required cookies been accepted for this page?

[qa_27/2022]

[softvision-raul-bucata]

@ksy36 We have received a couple of reports regarding this issue, but I was not able to reproduce the issue on other devices as well:

• www.facebook.com - desktop site instead of mobile site #106943
• www.facebook.com - desktop site instead of mobile site #106712

Tagging you so that the issue will appear as triaged

[jave808]

I opened case #107306 a few days ago. I've tried disabling all my add-ons (Adblock plus DownThemAll) but problem still persists.
You need to scroll down for at least 10-15 seconds before problem appears.

[softvision-raul-bucata]

@jave808 I was still unable to reproduce the issue following the extra info provided.
What I would do usually to test this kind of issue, is:

1. Type about:profiles in the url bar.
2. Choose Create a new profile.
3. Call it deleteme or anything you please.
4. Then start it. (this way you will be sure that nothing is interfering, no ghost caching etc.)
5. Test.

[inv_29/2022]

[softvision-raul-bucata]

@ksy36 I have managed to reproduce the issue on the latest build of Firefox Nightly and Firefox Release. Scrolling the page faster than the posts are loading, when the posts are being loaded, the page jumps:

I have also recorded a performance profile, as Firefox presented an increase in using the system resources of the device :

Performance profile: https://share.firefox.dev/3zy02XV

Tested with:

Browser / Version: Firefox Release 102.0.1 (64-bit)/ Firefox Nightly 105.0a1 (2022-07-25) (64-bit) /Chrome Version Version 103.0.5060.134 (Official Build) (64-bit)
Operating System: Windows 10 PRO x64

Notes:

1. Reproducible regardless of the status of ETP.
2. Reproducible on the latest build of Firefox Nightly and Release.
3. Scrolling in Chrome presents the same issue with posts not loading, but once the posts are loaded, the page does not present scrolling issues:
   

Moving this to NeedsDiagnosis for further investigations.

[qa_30/2022]

[ksy36]

I still can't reproduce this on the main facebook feed, tried on MacOS and Windows, following Raul's comment.

There is https://bugzilla.mozilla.org/show_bug.cgi?id=1779404 that has some ongoing investigation, so let's close this as a duplicate.