From MozillaZine Knowledge Base
This list of frequently-asked questions (FAQs) about Firefox is organized by subject and may include links to MozillaZine forum topics and other sources in addition to Knowledge Base articles. If you don't find an answer below, open the Help Contents from the Firefox menu, use the Knowledge Base Search function, or browse all articles in the Category:Firefox.
Bookmarks and browsing history
Extensions and themes
Privacy and security
Configuring and customizing Firefox