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Editorial Team
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Asked: 2026-06-10T19:15:08+00:00

Firefox developer web console is suddenly showing mutation events are deprecated… on a line

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Firefox developer web console is suddenly showing “mutation events are deprecated…” on a line within script.js but I’m not using such a script.

When I click to view the line in question the following code is highlighted:

e=true;break}if(!e)return false;if(""!=t){e=false;for(k=0;k<f.length;++k)if(t==f[k]){e=true;break}if(!e)return false;if(""!=u&&c){e=false;for(k=0;k<s.length;++k)if(u==s[k]){e=true;break}if(!e)return false}}else if(!b)return false;return true}if(isMozillaFirefox||isGoogleChrome||isAppleSafari){doc.addEventListener("DOMNodeInserted",j,false);doc.addEventListener("DOMNodeInsertedIntoDocument",h,false)}if(isInternetExplorer)if(getBrowserVersion()>=9){doc.addEventListener("DOMNodeInserted",j,false);doc.addEventListener("DOMNodeInsertedIntoDocument",
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1 Answer

  1. Editorial Team

    I disabled all addons and one-by-one enabled them again testing the web console. In case this helps someone else with the same error, the addon that causes the problem for me is called: DivX Plus Web Player HTML5 <video> 2.1.2.145

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