One major issue related with Firefox is the impact of buggy add-ons on its start-time and performance. Even if add-on is well coded and optimized, it uses system resources and having a large number of add-ons may affect your browsing experience. Mozilla developers are constantly working on it with add-on developers, and we may expect improvements in Firefox 4.
The newer beta of Microsoft’s Internet Explorer provides users detailed information about add-ons affecting their browsing experience. The IE 9 alerts and suggests uses to disable slow add-ons. Internet Explorer 9 has a new feature: Add-on Performance Advisor, which notifies users when the total performance impact of installed add-ons exceeds a threshold and shows the relative performance impact of each add-on. Users can see detailed information, and disable add-ons on the basis of their performance.
IE blog describes this new feature as: “Add-ons often decrease your browsing performance in crucial activities like opening new tabs or navigating to webpages. We describe two metrics to measure add-on performance: load time and navigation time. These metrics map to the two browser usage scenarios that we talked about above: tab creation and webpage navigation. These are the scenarios where add-ons are known to have the biggest performance impact on. IE9 monitors both the load time and navigation time for add-ons that are running in the browser. Each time you create a new tab or navigate to a webpage, IE records the load or navigation time for each add-on. IE stores the last 10 data points for each add-on and uses the data to calculate the average load or navigation time.”
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