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Firefox has released a lot of version, so what are the differences between firefox 3 and firefox 7?

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Too many to list, you might as well be comparing the difference between a viking long boat and a modern cruise liner. You may be better off if you were to check the Mozilla website or Bugzilla. – Mokubai Nov 6 '11 at 22:38
@Mokubai good point, I fixed the question – IAdapter Nov 6 '11 at 22:40
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You didn't really fix the question – just by adding "main"? Feel free to read the changelogs: mozilla.org/en-US/firefox/releases – slhck Nov 6 '11 at 23:05
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You mean other than memory leaks? – Moab Nov 6 '11 at 23:49
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Just go trough their features. You can access more under the Desktop menu at the top. – Tom Wijsman Nov 7 '11 at 0:45
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closed as not constructive by Mokubai, BloodPhilia, slhck, grawity, Tom Wijsman Nov 7 '11 at 0:44

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2 Answers

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  1. For me, the biggest "external" change is Panorama: built-in manager for multiple tab groups. If you like to have tens of tabs loaded at the same time, it can become messy after some time. With tab groups, you can easily divide tabs into working sets and switch between them.
  2. Speed improvements for JavaScript. I really felt it after change from 3.6 to 7.0.
  3. Compatibility with modern JavaScript, CSS improvements etc.
  4. Tiny one, but useful: I remember to be unable to scroll horizontally overflowing <div>s with middle mouse button click ;) Now it works fine.
  5. Some extensions are now able to be installed without browser restart.
  6. UI changes -- personally I didn't like most of them and reverted to old view. Needs some playing but is achievable with about:config changes, https://addons.mozilla.org/en-US/firefox/addon/status-4-evar/ and manual bars changes.
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The large proportion of changes are generally to do with fixing adherance to standards and supporting the newer standards.

I know one of the main changes between version 3 and 4 was the support for using hardware graphics accelerators for rendering items on a page which also paved the way for WebGL but since then I think they moved to a rapid version release plan similar to Chrome and there are less "major" changes and more bugfixes between versions.

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