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firefox error console warnings /ie:/expected declaration but found>skipped to next declartion/over 100

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source of:https://support. mozilla.com/en-UWarning: Unknown property 'border-top-right-radius'. Declaration dropped. Source File: http://support.mozilla.com/media/css/questions-min.css?build=2244b7a Line: 1Warning: Unknown property 'border-top-right-radius'. Declaration dropped. Source File: http://support.mozilla.com/media/css/questions-min.css?build=2244b7a Line: 1Warning: Unknown property 'border-top-right-radius'. Declaration dropped. Source File: http://support.mozilla.com/media/css/questions-min.css?build=2244b7a Line: 1

source of:https://support. mozilla.com/en-UWarning: Unknown property 'border-top-right-radius'. Declaration dropped. Source File: http://support.mozilla.com/media/css/questions-min.css?build=2244b7a Line: 1Warning: Unknown property 'border-top-right-radius'. Declaration dropped. Source File: http://support.mozilla.com/media/css/questions-min.css?build=2244b7a Line: 1Warning: Unknown property 'border-top-right-radius'. Declaration dropped. Source File: http://support.mozilla.com/media/css/questions-min.css?build=2244b7a Line: 1

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You can ignore (CSS) errors in the Tools > Error Console.
Those errors are only useful if you develop websites and want to check the HTML/CSS and JavaScript code for errors.
Most errors are code for other browsers like IE or browsers on other platforms or just typos or the result of bad coding.