{"id":15984,"date":"2010-11-11T18:04:38","date_gmt":"2010-11-11T12:34:38","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?p=15984"},"modified":"2026-10-12T13:31:11","modified_gmt":"2026-10-12T08:01:11","slug":"firefox-addons-for-web-designers","status":"publish","type":"post","link":"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/","title":{"rendered":"Best Firefox Add-ons for Web Designers (2026)"},"content":{"rendered":"<p>Firefox is still a favourite browser for web designers, thanks to excellent built-in developer tools and a solid add-on library. Our 2010 list of <strong>Firefox add-ons for web designers<\/strong> featured Firebug, IE Tab, YSlow and GridFox, all of which have since been retired or built into the browser. Here&#8217;s the updated toolkit for 2026.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-39031 alignnone\" src=\"https:\/\/www.quickonlinetips.com\/archives\/wp-content\/uploads\/firefox-design-021.jpg\" alt=\"Firefox add-ons for web designers\" width=\"500\" height=\"331\" srcset=\"https:\/\/www.quickonlinetips.com\/archives\/wp-content\/uploads\/firefox-design-021.jpg 500w, https:\/\/www.quickonlinetips.com\/archives\/wp-content\/uploads\/firefox-design-021-150x99.jpg 150w, https:\/\/www.quickonlinetips.com\/archives\/wp-content\/uploads\/firefox-design-021-300x198.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Quick answer:<\/strong> Start with Firefox&#8217;s built-in DevTools (Inspector, CSS Grid and Flexbox inspectors, Responsive Design Mode, eyedropper and screenshots), then add Web Developer, ColorZilla, Fonts Ninja, Wappalyzer and axe DevTools. Together they cover layout, colours, fonts, technology checks and accessibility.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6ae9bf51c588e\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #1a202c;color:#1a202c\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #1a202c;color:#1a202c\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6ae9bf51c588e\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#Built-in_Firefox_tools_that_replaced_old_add-ons\" >Built-in Firefox tools that replaced old add-ons<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#Best_Firefox_add-ons_for_web_designers\" >Best Firefox add-ons for web designers<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#1_Web_Developer\" >1. Web Developer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#2_ColorZilla\" >2. ColorZilla<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#3_Fonts_Ninja\" >3. Fonts Ninja<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#4_Wappalyzer\" >4. Wappalyzer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#5_axe_DevTools\" >5. axe DevTools<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#What_happened_to_the_2010_picks\" >What happened to the 2010 picks?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#Tips_for_using_design_add-ons\" >Tips for using design add-ons<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#Is_Firebug_still_available\" >Is Firebug still available?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#What_is_the_best_Firefox_add-on_for_web_designers\" >What is the best Firefox add-on for web designers?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.quickonlinetips.com\/archives\/2010\/11\/firefox-addons-for-web-designers\/#Do_Firefox_add-ons_work_in_Firefox_Developer_Edition\" >Do Firefox add-ons work in Firefox Developer Edition?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Built-in_Firefox_tools_that_replaced_old_add-ons\"><\/span>Built-in Firefox tools that replaced old add-ons<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Firefox DevTools<\/strong> (press F12) replaced Firebug, which was discontinued. Inspect and edit HTML and CSS live, and debug JavaScript.<\/li>\n<li><strong>Storage Inspector<\/strong> replaced Firecookie for viewing and editing cookies and local storage.<\/li>\n<li><strong>CSS Grid and Flexbox inspectors<\/strong> overlay your layout grid, replacing GridFox.<\/li>\n<li><strong>Responsive Design Mode<\/strong> (Ctrl+Shift+M) previews your design at phone and tablet sizes.<\/li>\n<li><strong>Eyedropper<\/strong> picks any colour on the page.<\/li>\n<li><strong>Screenshots<\/strong>: right-click a page and choose Take Screenshot to capture an element or the full page.<\/li>\n<li><strong>Font panel<\/strong> in the Inspector shows which fonts an element uses.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Best_Firefox_add-ons_for_web_designers\"><\/span>Best Firefox add-ons for web designers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Web_Developer\"><\/span>1. Web Developer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/web-developer\/\" target=\"_blank\" rel=\"noopener\">Web Developer<\/a> by Chris Pederick adds a toolbar to disable CSS, outline elements, show image sizes, view alt text and much more. A classic that&#8217;s still maintained.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_ColorZilla\"><\/span>2. ColorZilla<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/colorzilla\/\" target=\"_blank\" rel=\"noopener\">ColorZilla<\/a> is an advanced colour picker with a palette history and a CSS gradient generator.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Fonts_Ninja\"><\/span>3. Fonts Ninja<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/fonts-ninja\/\" target=\"_blank\" rel=\"noopener\">Fonts Ninja<\/a> identifies fonts on any website with one click, showing size, weight and line height.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Wappalyzer\"><\/span>4. Wappalyzer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/wappalyzer\/\" target=\"_blank\" rel=\"noopener\">Wappalyzer<\/a> shows the CMS, frameworks, analytics and other technologies a site uses. Handy when a client says &#8220;make it like this site&#8221;.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_axe_DevTools\"><\/span>5. axe DevTools<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/axe-devtools\/\" target=\"_blank\" rel=\"noopener\">axe DevTools<\/a> adds accessibility checks to Firefox DevTools, flagging contrast, missing labels and other issues.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_happened_to_the_2010_picks\"><\/span>What happened to the 2010 picks?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>IE Tab<\/strong>: Internet Explorer is retired. Test in real Chrome, Safari and Edge, or use a cross-browser testing service.<\/li>\n<li><strong>YSlow<\/strong>: use Google PageSpeed Insights and Firefox&#8217;s Performance panel instead.<\/li>\n<li><strong>Aardvark and Palette Grabber<\/strong>: no longer available; DevTools and ColorZilla cover most of their features.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tips_for_using_design_add-ons\"><\/span>Tips for using design add-ons<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Install only what you use; too many add-ons slow the browser.<\/li>\n<li>Check permissions, since design add-ons can read every page you visit.<\/li>\n<li>Create a separate Firefox profile for design work to keep your main browser clean.<\/li>\n<li>Try Firefox Developer Edition for early access to new DevTools features.<\/li>\n<\/ul>\n<p><em>Originally written by guest author Sonia Mansfield, content editor for PsPrint.com. Updated for 2026 by QuickOnlineTips.<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Is_Firebug_still_available\"><\/span>Is Firebug still available?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Firebug was discontinued, and its features are built into Firefox DevTools.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_best_Firefox_add-on_for_web_designers\"><\/span>What is the best Firefox add-on for web designers?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Web Developer is the most versatile, with ColorZilla for colours and Fonts Ninja for fonts.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_Firefox_add-ons_work_in_Firefox_Developer_Edition\"><\/span>Do Firefox add-ons work in Firefox Developer Edition?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, Developer Edition supports the same add-ons as regular Firefox.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firefox is still a favourite browser for web designers, thanks to excellent built-in developer tools and a solid add-on library&#8230;.<\/p>\n","protected":false},"author":4,"featured_media":39031,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[48],"tags":[44],"class_list":["post-15984","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-downloads","tag-guest-posts"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/posts\/15984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=15984"}],"version-history":[{"count":1,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/posts\/15984\/revisions"}],"predecessor-version":[{"id":64487,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/posts\/15984\/revisions\/64487"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media\/39031"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=15984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/categories?post=15984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/tags?post=15984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}