Being a web developer there are some tools which I need and use on daily basis. Here are 5 such addons I think every web developer should install on their firefox.
1- Web developer toolbar
Home: http://chrispederick.com/work/web-developer/
Install: https://addons.mozilla.org/en-US/firefox/addon/60

This addon adds a toolbar and a menu to firefox. The toolbar contains several mini tools in it to perform various tasks. It has 11 built in menus for different tasks like cookies, css, forms, html, images and many others. You can read a review of web developer toolbar here.
2- JSONView
Home: http://benhollis.net/blog/2009/02/24/jsonview-view-json-documents-in-firefox/
Install: https://addons.mozilla.org/en-US/firefox/addon/10869

JSON is becoming more popular day by day as a data exchange format. JSONView allows you to view json documents in the browser itself without having to open in any text editor and format it. Local files can also be seen if they have .json extension. It formats the document nicely and also provides options to collapse/expand nodes too (just like XML).
In case of invalid json it reports an error.
3- Fireftp
Home: http://fireftp.mozdev.org/
Install: https://addons.mozilla.org/en-US/firefox/addon/684

You will not have to open a separate ftp client if you use this. To open Fire FTP, go to Tools -> Fire FTP on firefox menu bar. It opens an easy to use interface in a new tab. You can create multiple accounts and you will get all the features that you expect from a ftp client.
From the site: “Along with transferring your files quickly and efficiently, FireFTP also includes more advanced features such as: directory comparison, syncing directories while navigating, SFTP, SSL encryption, search/filtering, integrity checks, remote editing, drag & drop, file hashing, and much more!”
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