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[[Compatibility/Taxonomy|Why sites are failing in Firefox? ]] What can we do when this is happening?  * '''The Web site is using a specific vendor technology'''. Examples: Think about prefixed CSS and JavaScript. Specific codec for video supported only in one browser, platform, … ** We can outreach the site. Long process and not always successful** We may be able to shim it inside Firefox while attempting to do outreach.** We can fix it in Firefox if really widespread on too may sites. It becomes (unfortunately) part of the Web reality.* '''The Web site is sending a specific working version of the site'''. Often based on user agent sniffing both on the client side or/and the server side. Examples: Different tier version for different browsers (Google search, Baidu, etc.). These can be very difficult to solve. It's more business related than a technical issue.** We can outreach to the site, if we can demonstrate that the other version is working well in Firefox.** We can create a UA override in some circumstances. Drawback: we disappear from the statistics.* '''The Web site is sending to a specific interactions of the site through features detections.''' ** We can outreach to the site.** We can try to shim it.* '''The Web site is using a standard technology not yet supported by Firefox.''' Example: SpeechRecognition. This creates a load of secondary issues such as adding future code detection legacies. The Webcompat issues of today are sometimes created by the lack of support of technologies of yesterdays.** We need to fix it in Firefox. * '''The Web site is using a non-standard technology not yet supported by Firefox.''' Example from the past: innerText, window.event, … These are hard to fix. When we fix it in Firefox, we create secondary compatibility issues, because sites were relying on it. Example: using window.event, to target the detection of keyCode.** We can fix it in Firefox, but we need to deal with the consequences too. ** We can outreach if the problem is not widespread.