https://addons.mozilla.org/en-US/firefox/addon/2691/
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A developer tool for interacting with web services and other web resources that lets you make HTTP requests, set the entity body, and content type. This allows you to interact with web services and inspect the results...
very neat and useful indeed!
https://chrome.google.com/webstore/detail/bnbbfjbeaefgipfjpdabmpadaacmafkj
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Firebug Lite easily integrated into Chrome. Even if I am not a fan of Chrome, because of the omnipotence of Google, I find this tool very useful as a debug facility.
https://addons.mozilla.org/fr/firefox/addon/1158/
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TAW3 with a click allows to verify, with just a click, the accessibility of the Web sites that you are visiting, by means of the TAW3 online service (www.tawdis.net) and making use of the W3C Web Content Accessibility Guidelines (WCAG 1.0 and WCAG 2.0).
The description says: "Offers the possibility to display documents in browser window.". A great addon for when debugging XML / json / whatever content type Firefox wants to open in an external editor
Zemanta is a text enrichment tool. Packaged as a firefox extension, it helps adding tags, photos, links to the texts you type in your web browser. It is based on "natural language processing, machine learning and fine tuning", and would take profit out of SemWeb technologies.
http://www.evolus.vn/Pencil/Home.html
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With the power of the underlying Mozilla Gecko engine, Pencil turns your excellent Firefox 3 browser into a sketching tool with just a 400-kilobyte installation package.
Jan-Piet Mens / whatmon: Mozilla Extension for Monitoring Whatever
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http://blog.fupps.com/documents/mozilla-extensions/whatmon-mozilla-extension-for-monitoring-whatever/
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whatmon periodically reads a short bit of XML text from a web server (in my case: Apache). The XML contains an integer status and a single line of text. In practice, that line of text can contain whatever the administrator desires. I want an indication of the health of the mail queues on a number of mail servers we have inhouse. The line of text therefore contains two-letter codes with which I can identify the hostname of the mail server in question as well as a count of mails on the queue for each of the servers in question.
https://www-128.ibm.com/developerworks/xml/library/x-xformsfirefox/
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Using the experimental Mozilla XForms extension, you can process XForms in your browser today. While not yet deployed widely enough for use on the public Internet, XForms may be suitable for some intranet applications. This article demonstrates basic XForms processing as currently supported by Firefox and the Mozilla XForms plug-in.
Mozilla Labs Blog » Blog Archive » Introducing Operator
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https://labs.mozilla.com/2006/12/introducing-operator/
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Today Mozilla Labs is releasing Operator, a microformat detection extension developed by Michael Kaply at IBM. Operator demonstrates the usefulness of semantic information on the Web, in real world scenarios.