According to a post on the Mozilla Add-Ons Blog, 85% of Firefox 4 users have at least one add-on installed. The average user has five add-ons installed. The figure doesn’t include the Personas feature and excludes add-ons bundled with other software that users haven’t actively chosen to install.
“We previously estimated that at least a third of Firefox users had chosen to install an add-on, but knew the number was higher than that,” wrote Justin Scott, the product manager for add-ons at Mozilla.
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