Strangely, Mozilla has introduced a new version of Firefox so soon after Firefox 4.0 was released considering how long the 3.x branch was going on. While the reasons why Mozilla Firefox has released version 5.0 so soon after the release of 4.0, we're going to take a guess that it had to do with the Do-Not-Track header, a privacy feature long awaited in a mainstream browser.
Additionally, there are several security issues which have been addressed in jumping so far ahead in versioning.
Firefox 5 is licensed as Freeware for Windows (32-bit and 64-bit) operating system / platform from internet browsers without restrictions. Firefox 5 5.0.1 is available to all software users as a free download (Freeware).
Compatibility with this software may vary, but will generally run fine under Microsoft Windows 10, 8, 8.1, 7, Vista and XP on either a 32-bit or 64-bit setup. A separate x64 version may be available from Mozilla.
We have tested Firefox 5 5.0.1 against malware with several different programs. We certify that this program is clean of viruses, malware and trojans. [Read more]