Firebug 1.5.0 https://addons.mozilla.org/en-US/firefox/addon/1843 Firebug
integrates with Firefox to put a wealth of development tools at your
fingertips while you browse. You can edit, debug, and monitor CSS, HTML,
and JavaScript live in any web page... Firebug integrates with Firefox
to put a wealth of development tools at your fingertips while you
browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live
in any web page. Visit the Firebug website for documentation, screen
shots, and discussion forums: 说明：查看，编辑，Debug页面的CSS,HTML,JavaScript。超强的开发调试的工具，开发人员必装。
JavaScript Debuger 0.9.87.4 https://addons.mozilla.org/en-US/firefox/addon/216 Venkman
is the code name for Mozilla‘s JavaScript Debugger. Venkman aims to
provide a powerful JavaScript debugging environment for Mozilla based
browsers. 说明：firefox 环境下的 JavaScript Debugger, 强大的脚本调试工具。
Add N Edit Cookies 0.2.1.3 https://addons.mozilla.org/en-US/firefox/addon/573 Cookie Editor that allows you add and edit "session" and saved cookies. 说明：查看并且修改 cookies, 不方便的地方是显示所有浏览器的 cookies 而不仅是当前页。
XPath Checker 0.4.1 https://addons.mozilla.org/en-US/firefox/addon/1095 An
interactive editor for XPath expressions. Choose ‘View XPath‘ in the
context menu and it will show the editor. You can edit the XPath
expression and it incrementally updates the results. 说明：据说可以调试 XPath。
YSlow 2.0.6 https://addons.mozilla.org/zh-cn/firefox/addon/5369 YSlow analyzes web pages and why they‘re slow based on Yahoo!‘s rules for high performance web sites. 说明：能够帮我们分析web页面比较慢的原因，它是基于Firebug的，也能分开浏览web页面的元素，比如js,css.
Relaxed the HTML Validator 0.9.5 https://addons.mozilla.org/en-US/firefox/addon/3939 "Relaxed"
is a HTML validator which validates HTML documents using it‘s own
schema definitions written in Relax NG with embedded Schematron
patterns.: 说明：直接在当前页面上进行 HTML validation, 界面清晰直观。
Total Validator 6.2.0 https://addons.mozilla.org/en-US/firefox/addon/2318 by Andy Halford Perform
multiple validations and take screen shots in one go. This 5-in-1
validator works with external, internal, or local web pages using the
Total Validator service or local copy of the desktop tool... 说明：把当前页面在 http://www.totalvalidator.com 做HTML Validation,输出结果用红字进行了语法修正, 比较友好。不过由于通过其他网站验证, 速度有点慢, 并且结果不易保存。
RankQuest SEO Toolbar 3.9.2 https://addons.mozilla.org/en-US/firefox/addon/1471 RankQuest
SEO(Search Engine Optimization) Toolbar provides you quick access to
more than 30 intuitive SEO tools. Alexa Rank and Page Rank provided by
Alexa and Google respectively ensures the popularity of the site. Once
you download and install the SEO Toolbar you are only one or two clicks
away from carrying out most of your day to day SEO... 说明：SEO 工具插件, 访问一个页面时, 显示此页面的各种排名及 SEO 信息。
This
is a cut down version of IE View by Paul Roub, which is 47.4 KB. All
the same UI and features are there. It has a right click menu item to
open a page in IE and a list of sites to always open in IE. It can close
tabs automatically and send... 说明：点右键可以选择在 IE 中打开页面, 有助于跨浏览器调试。
TimeStamp Converter 2.0.0 https://addons.mozilla.org/en-US/firefox/addon/2063 Converts dates and timestamps.Context menu option to convert the selected timestamp into a date. 说明：除去从上下文中转换, 还可以手动将 timestamp 时间戳与 date/time 转换。
Fire Encrypter 4.0 https://addons.mozilla.org/en-US/firefox/addon/2063 FireEncrypter
is an Firefox extension which gives you encryption/decryption and
hashing functionalities right from your Firefox browser, mostly useful
for developers or for education & fun... 说明：将文字加密成各种算法的密文, 甚至包括摩尔斯码。
Add-in-one Sidebar https://addons.mozilla.org/en-US/firefox/addon/1027 AiOS
lets you open various windows as sidebar panels, and quickly switch
between them. So it put an end to the window chaos! In addition to
bookmarks and history it opens dialogues such as downloads, add-ons and
more in the sidebar. 说明：在浏览器左侧增加打开书签, 历史, 插件等的工具条。
