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Common response to troubleshoot website breakage issue

<!-- CONTRIBUTOR NOTE: 1. Check whether the question contains an exact URL / site name. If not, ask for it. 2. If you can, try to reproduce the issue in a browser, different from Firefox. If it also reproduces itself there, then it's not a Firefox issue. Explain it to the OP. If it doesn't, proceed to step 3. 3. If you can, try to reproduce the issue in a CLEAN PROFILE. If it's reproducible, please report it yourself on WebCompat (https://webcompat.com/issues/new), preferably with your GitHub account, or directly on Bugzilla (https://bugzilla.mozilla.org/enter_bug.cgi?product=Web+Compatibility&component=Site+Reports). 4. If you the issue doesn't reproduce itself, or you can't try that (e.g., when an account on the problematic website is needed), proceed to the steps below. --> Hi, Sorry to hear that the page doesn't work as expected. In order to look for the root cause, please follow the steps below and provide us with more information to troubleshoot your issue. # Please check if you have Enhanced Tracking Protection (ETP) enabled. You can do that by clicking the shield [[Image:Fx89ShieldIcon]] icon at the left of the address bar. #* If ETP is enabled, try disabling it. Does the problem persist? # If the problem is not fixed, try [[How to clear the Firefox cache | clearing Firefox cache]]. Does it help? # If it does not help, also try [[Clear cookies and site data in Firefox | clearing cookies and data]] for the website you experience troubles with (''warning: you will be logged out on this website''). Does it help? # If it also does not help, try [[Diagnose Firefox issues using Troubleshoot Mode | running Firefox in Troubleshoot Mode]]. Does the problem persist? # Finally, if the problem is still not fixed, please check if it persists in other browsers (e.g. Chrome, Edge, Opera or Safari). #* If it does, it is most likely an issue on the website's side. You may want to inform the website owner or administrator about that. #* If it doesn't, that's a compatibility issue. Please report it on [https://webcompat.com/issues/new Webcompat], so that our team there may be able to look into it. We'd also appreciate posting a link to your report here. Looking forward to your update! <!-- Some additional troubleshooting steps Could you please try [[Manage Firefox profiles | creating a new Firefox profile]] and checking whether the issue persists there? What kind of ETP setting you have? To find out, go to ''about:preferences#privacy'' and let us know if you set it to Standard/Strict/Custom. '''Check if the issue is caused by Total Cookie Protection (TCP)''' <i>'''WARNING from the moderator team:''' ''Changing Firefox pref from the about:config page can sometimes break Firefox or cause strange behavior. You should only do this if you know what you're doing. Please read [[Firefox advanced customization and configuration options]] to learn more. '' </i> * Go to about:config and check if the pref “''network.cookie.cookieBehavior''” is set at 5, which means that TCP is enabled together with ETP. If the pref value is not 5, then the issue is not TCP-related. * Set the pref “''network.cookie.cookieBehavior''” to 4 and check if the issue still exists. If the issue disappears, then it is a TCP breakage. In that case, you can file a report through [https://mzl.la/anti-tracking-breakage Bugzilla] or reach out the [https://matrix.to/#/#anti-tracking:mozilla.org #anti-tracking] team on Matrix. -->