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They are powerful… This is GTDInbox adding task management to Gmail. The power is the ability to modify any webpage. Audible.com once made an unpopular (bad usability) site redesign; and the users revolted. They used Greasemonkey to revoke the old design.
They open new marketing channels… Mozilla actively pushes extensions to their massive userbase. The potential for innovation means blogs will voluntarily spread the news about cool extensions.
They fortify market positions… Google et all fear the competitor is only ‘one click away’ By installing themselves into the browser, they become the first choice for a user. The value of this idea provided the bulk of Mozilla’s $53,000,000 revenue in 2005 (paid by Google to appear in search bar)
They change fundamental assumptions about the Web… Extensions like Operator and WebCards do ‘information broking’ They move previously ‘locked’ data between sites For instance, they could move a contact from LinkedIn to another social network with a few clicks
They open up completely new possibilities… StumbleUpon monitors your browsing habits to infer ‘taste’ It then matches you with similar users… And makes recommendations that let you discover completely new topics & sites A concept made viable only by being a browser extension
So, what’s the point? Exploit Innovation! A Firefox extension is powerful and easy to develop. They are relatively untapped – not that many people make them. Therefore there is still the ability to stand out – to innovate. And with innovation comes attention. The nett effect is better for you (& whatever else you’d like to promote), and better for us users!
Are there any drags to all this? Firefox gets updated and has been known to break extensions. Different platforms can behave strangely. And, if you interact with a site, you have to update every time it does. The bottom line is that extensions require maintenance.
And dangers? Yes, the legal issue. My first extension could put eBay inside Amazon and Amazon inside eBay. On the one hand, arguably no different from one of the dozens of price comparison sites. And, one could claim it is just another way of rendering a site (just as IE/Firefox each render differently). But do you really want to go to court against someone like Amazon to prove it?? Be sensible in what you choose!
Useful References http://developer.mozilla.org/en/docs/Extensions http://kb.mozillazine.org/Getting_started_with_extension_development http://greasespot.net/ http://www.rietta.com/firefox/Tutorial/overview.html (Just search Google ‘ develop Firefox extensions ’) Also, all extensions are open source (download, rename .XPI -> .ZIP and extract the source) Learn from others!