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copied!<p>Here is an old JS function that usually worked well for me (Before <a href="https://addons.mozilla.org/en-US/firefox/addon/stylish/" rel="nofollow">Stylish</a> and <a href="https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/" rel="nofollow">Greasemonkey</a>).</p> <p>Note that plain JS has security restrictions from accessing some stylesheets. A FF add-on can get around that, but then you need to also beware of corrupting browser-chrome styles.</p> <pre><code>function replaceStyleRuleByName (sStyleName, sNewRule) { var iNumStyleSheets = document.styleSheets.length; var bDebug = 0; if (bDebug) console.log ('There are ' + iNumStyleSheets + ' style sheets.'); for (iStyleS_Idx=0; iStyleS_Idx < iNumStyleSheets; iStyleS_Idx++) { var iNumRules = 0; var zStyleSheet = document.styleSheets[iStyleS_Idx]; if (zStyleSheet) { /*---WARNING! This next line can throw an uncaught exception! Error: uncaught exception: [Exception... "Access to restricted URI denied" code: "1012" nsresult: "0x805303f4 (NS_ERROR_DOM_BAD_URI)" location: ... ...] */ //--- try/catch for cross domain access issue. try { var zRules = zStyleSheet.cssRules; if (zRules) { iNumRules = zRules.length; } } catch (e) {// Just swallow the error for now. } } if (bDebug) console.log ("Style sheet " + iStyleS_Idx + " has " + iNumRules + " ACCESSIBLE rules and src: " + zStyleSheet.href); //for (var iRuleIdx=iNumRules-1; iRuleIdx >= 0; --iRuleIdx) for (var iRuleIdx=0; iRuleIdx < iNumRules; ++iRuleIdx) { if (zRules[iRuleIdx].selectorText == sStyleName) { zStyleSheet.deleteRule (iRuleIdx); if (bDebug) console.log (sNewRule); if (sNewRule != null) { zStyleSheet.insertRule (sStyleName + sNewRule, iRuleIdx); } //return; //-- Sometimes changing just the first rule is not enough. } } //--- Optional: Punt and add the rule, cold, to any accessible style sheet. if (iNumRules > 0) { if (sNewRule != null) { try { zStyleSheet.insertRule (sStyleName + sNewRule, iRuleIdx); } catch(e) {// Just swallow the error for now. } } } } return; } </code></pre> <p><br> <strong>Sample Usage:</strong></p> <pre><code>replaceStyleRuleByName ('body', '{line-height: 1.5;}' ); replaceStyleRuleByName ('#adBox', '{display: none;}' ); replaceStyleRuleByName ('.BadStyle', null ); </code></pre>

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