Firefox 3.5

Mozilla Firefox 3.5

Firefox 3.5 on Ubuntu displaying Wikipedia.
Developer(s)	Mozilla Corporation Mozilla Foundation
Initial release	June 30, 2009 (2009-06-30)
Final release	3.5.19 (April 28, 2011; 13 years ago (2011-04-28))
Preview release	Non [±]
Written in	C++, XUL, XBL, JavaScript,[1] CSS[2][3]
Engine	Gecko
Operating system	Windows Mac OS X Linux BSD Solaris OpenSolaris OS/2
Platform	Cross-platform
Size	9.4 MB (Linux) 17.2 MB (Mac OS X) 7.7 MB (Windows) (all archived)
Available in	75 languages
Type	Web browser FTP client Gopher client
License	MPL/GNU GPL/GNU LGPL/about:rights
Website	www.mozilla.com/firefox

Market share overview According to StatCounter data November 2024[4] This box: view talk edit

Browser % of Fx % of total Firefox 1 — — Firefox 2 — — Firefox 3 — — Firefox 4 — — Firefox 5–9 — — Firefox 10–16 0.39% 0.01% Firefox 17–23 — — Firefox 24–30 — — Firefox 31–37 — — Firefox 38–44 — — Firefox 45–51 — — Firefox 52–59 1.54% 0.04% Firefox 60–67 — — Firefox 68–77 — — Firefox 78–90 0.39% 0.01% Firefox 91–101 — — Firefox 102–114 — — Firefox 115 and 115 ESR 9.65% 0.25% Firefox 116 — — Firefox 117 — — Firefox 118 2.70% 0.07% Firefox 119 — — Firefox 120 — — Firefox 121 — — Firefox 122 — — Firefox 123 — — Firefox 124 — — Firefox 125 0.39% 0.01% Firefox 126 0.39% 0.01% Firefox 127 0.77% 0.02% Firefox 128 and 128 ESR 3.09% 0.08% Firefox 129 0.39% 0.01% Firefox 130 0.77% 0.02% Firefox 131 5.41% 0.14% Firefox 132 61.00% 1.58% Firefox 133 5.02% 0.13% Firefox 134 — — All variants[5] 100% 2.59%

Related articles
Firefox version history Firefox early version history v2 v3 v3.5 v3.6 v4 Features of Firefox Gecko Add-ons WebExtensions
Origins and lineage
Netscape Navigator Mozilla Foundation Mozilla Suite
Category
v t e

Mozilla Firefox 3.5 is a version of the Firefox web browser released in June 2009, adding a variety of new features to Firefox. Version 3.5 was touted as being twice as fast as 3.0 (due its TraceMonkey JavaScript engine and rendering improvements). It includes private browsing, has tear-off tabs, and uses the Gecko 1.9.1 engine. It was codenamed Shiretoko during development,^[6] and was initially numbered Firefox 3.1 before Mozilla developers decided to change the version to 3.5, to reflect the inclusion of a significantly greater scope of changes than were originally planned.^[7] It is the last major version to support X BitMap images.

Estimates of Firefox 3.5's global market share in February 2010 were around 15–20%^[8][9][10] and rose rapidly in July 2009 as users migrated from Firefox 3.0. From January 2010 it began to decline as users migrated to Firefox 3.6. Between mid-December 2009 and February 2010, Firefox 3.5 was the most popular browser (when counting individual browser versions) according to StatCounter,^[11] and as of February 2010^[update] was one of the top 3 browser versions according to Net Applications.^[12] Both milestones involved passing Internet Explorer 7, which previously held the No. 1 and No. 3 spots in popularity according to StatCounter and Net Applications, respectively.

Due to the January 2010, well-publicized vulnerability in Microsoft's Internet Explorer browser, the German, French, and Australian governments had publicly issued warnings to Internet Explorer users to use alternative browsers, at least until a fix for the security hole was made.^[13][14][15] The first browser they recommended was Mozilla Firefox, followed by Google Chrome.