Firefox 4
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Firefox 4, which shipped on March 22, 2011, enhances performance, adds more support for HTML5 and other evolving Web technologies, and further improves security.
Firefox 4 for developers - MDC
Mozilla is fighting poor performance in Firefox on many fronts. Firefox 3.6 was already a significant improvement over 3.5, and Firefox 4 promises to be lightning fast. However, Firefox is already pretty fast.
How to Improve Extension Startup Performance « Mozilla Add-ons Blog
A little over a month ago I posted the first compatibility notice for add-on developers .
Add-on compatibility for Firefox 4 – beta 4 edition « Mozilla Add-ons Blog
Blog Archive » How we’re breaking some extensions in the near future
You may have read some reports about how we’re re-implementing the bulk of the extension manager in Firefox. It’s been a long running project (something like a year since I first really started planning how to do it). Things are finally started to come together and all being well we are likely to look at landing the first pieces of this on the trunk nightlies in as little as a weeks time. I’ll be up front, this isn’t going to be a perfect landing. There may be some thing that are missing and other bits where the user experience isn’t as perfect as it will be finally. Of course there may also be bugs we have to rush to fix.
Addon - MDC
Introduced in Gecko 2.0 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1) An Addon represents an add-on that is either installed or can be installed.
Code Samples - MDC
Getting the directory where your addon is located If you need to determine the directory in which your add-on is installed, code like the following will do the trick. Simply replace YOUREXTENSIONID with your add-on's ID.
