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What has changed Firefox 1.0

There have been some major improvements in Tab Browsing in Firefox 1.0

New options for controlling where links from other applications open.


New experimental options for controlling where links in web pages open. To make these experimental options appear, set browser.tabs.showSingleWindowModePrefs to true in about:config.


Firefox is now available in 14 languages.
Unofficial Firefox 1.0 changelog