Very Useful Firefox/Mozilla addons

Tamper Data 10.1.0

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters.

Trace and time http response/requests.

Security test web applications by modifying POST parameters.

FYI current version of Google Web Accelerator is incompatible with the tampering function of TamperData. Your browser will crash.

Code:

https://addons.mozilla.org/en-US/firefox/addon/966



WorldIP 1.1.4

WorldIP is a free add-on for Mozilla Firefox. The add-on, when installed into your Web browser, shows up-to-date information about real physical location of a web server you are currently visiting.

WorldIP extension is one of WIPmania's products based on WorldIP geolocation database. The database is more correct than Whois records and Whois-based databases, that show geographic locations of network owners, and not the geographic location of networks themselves.

WorldIP plugin is highly configurable. It can display your own IP address, and the Web-server used running on that server, such as Apache, nginx and so on. If desired, it transfers you to Wip-Map information system.
Code:

https://addons.mozilla.org/en-US/firefox/addon/8661


Xmarks (formerly Foxmarks) 3.1.0

It takes only a moment to get up and running with Xmarks. After you install the add-on, click on the notification to set up Xmarks and start backing up and synchronizing your bookmarks. Install Xmarks on each computer you use, and it seamlessly integrates with your web browser and keeps your bookmarks safely backed up and in sync.

Xmarks will sync across browsers too. Today we support Firefox, Internet Explorer, and Safari (Mac OS). Please visit our website at xmarks.com for details.

Secure Password Sync is an optional Xmarks feature. If you'd like to learn more about how it works, visit:
Code:

http://www.xmarks.com/about/features/secure_password_sync




Xmarks provides seamless bookmark synchronization between your computers and browsers via our synchronization server. Your bookmark (and optionally password) data is securely stored and backed up on our servers.

Our discovery services help you assess the quality of websites you visit, as well as find similar sites with a single click. For example, when you search on Google or other search engines, we compare your search results against data on our servers in order to recommend sites that have been frequently bookmarked. Our discovery services are powered by analyzing anonymously and in aggregate the millions of bookmarks on our servers--in this way we are leveraging the wisdom of crowds to powerfully enhance your searching and browsing experience.

In order to continuously improve the utility of Xmarks, we may collect certain data such as which features are enabled or disabled, and how our features are being used. Details may be found in our privacy policy:
Code:

http://www.xmarks.com/about/privacy


To learn about many more features of Xmarks, visit our feature pages:
Code:

http://www.xmarks.com/about/features


Get the latest news about Xmarks at our blog:
Code:

http://blog.xmarks.com/


Xmarks was formerly known as Foxmarks.

Code:

https://addons.mozilla.org/en-US/firefox/addon/2410


Server Spy 0.1.6

Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites. When a tab is selected, the corresponding server name is shown on the right-hand side of the browser's status bar.
Code:

https://addons.mozilla.org/en-US/firefox/addon/2036


SearchStatus 1.30

Display the Google PageRank, Alexa rank, Compete ranking and SEOmoz Linkscape mozRank anywhere in your browser, along with fast keyword density analyser, keyword/nofollow highlighting, backward/related links, Alexa info and other SEO tools.
Code:

https://addons.mozilla.org/en-US/firefox/addon/321


AutoPager 0.5.1.3

The AutoPager Firefox extension automatically loads the next page of a site inline when you reach the end of the current page for infinite scrolling of content.
It includes a adblock similar features to allow you filter out the ads from the contents in the loaded page contents.
It works well with most of the greasemonkey scripts.
By default AutoPager works with a ton of sites, including Lifehacker, the New York Times, Digg, and, of course, Google. If you want to add your own custom autopaging to unsupported sites, the site wizard feature makes it easy (first pick the Next link, then pick only the content you want loaded. The site workshop provide more features like auto discovery the links and content.
It's configuration is base on XPath. You can find there is a built in function to create a XPath by click some links on the pages. This extension will import online configuration from this sources,these configurations includes support for some widely used sites and some general support for forums.
You can also share your site rules by click public button in the setting dialog.
You can find XPath tutorials at

Code:

http://www.w3schools.com/xpath/ and http://www.zvon.org/xxl/XPathTutorial/General/examples.html.

You can always get the stable version here and the newer develop version at:
Code:

http://www.teesoft.info/content/view/68/1/


You can find some tips for creating AutoPager rules for new sites:
Code:

http://www.teesoft.info/content/view/64/49/


Code:

https://addons.mozilla.org/en-US/firefox/addon/4925



ArchView 0.7.1

ArchView can open archive file online without downloading the whole archive. Just like normal web pages. It is very fast since it merely fetches a small portion of the archive file from server. ArchView supports RAR, ZIP formats and ISO CD image; HTTP, FTP and file: protocols. And it can present XUL or HTML interface.

Code:

https://addons.mozilla.org/en-US/firefox/addon/5028



Alexa Sparky 1.3.0

Sparky is a free Firefox browser plugin built by Alexa, that accompanies you as you surf, providing useful information about the sites you visit without interrupting your Web browsing.

* Learn about Website Traffic Trend information -- Is this site getting more popular, or less popular?

* Get detailed traffic information including Reach and Rank -- How does this site's traffic compare to other sites on the Web?

* Surf more efficiently with Related Links for each page -- If I like this site, are there others that I might want to visit?

Plus, as you surf around the Web with Sparky you are helping to make the Web a better place for everybody by contributing to the traffic information that Alexa provides.

Code:

https://addons.mozilla.org/en-US/firefox/addon/5362



Web Developer 1.1.6

Adds a menu and a toolbar with various web developer tools.

Code:

https://addons.mozilla.org/en-US/firefox/addon/60


Adblock Plus 1.0.2

Right-click on a banner and choose "Adblock" from the context menu - the banner won't be downloaded again. Maybe even replace parts of the banner address with star symbols to block similar banners as well. Or you select a filter subscription when Adblock Plus starts up the first time, then even this simple task will usually be unnecessary: the filter subscription will block most advertisements fully automatically.

Code:

https://addons.mozilla.org/en-US/firefox/addon/1865