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I am using Windows Vista. Whenever I launch Firefox 4, it takes a long time to start and appear on the screen.

What could be causing this slow start time and are there any solutions which can speed it up?

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What do you mean by a long time? Could you grab a stop-watch and time it for us? We can then compare that to how long it takes us to start it and we can get a good comparison. – Majenko Apr 15 '11 at 9:08
it takes atleast 40 to 50 seconds – Praveen Apr 15 '11 at 9:16
related:… – studiohack Apr 16 '11 at 19:39
up vote 4 down vote accepted

One of the main reasons (according to Mozilla) for slow Firefox startup times are addons. See this link, where Mozilla talks about this issue. Some results are posted here. There are some disputes about this, so the list is not as comprehensive as it should be.

As Xr, says try to disable some addons and see if it loads faster (though this will be difficult to do visually). There are also some hacks - Firefox Preloader and this - to speed up launch times, try them out.

Edit : I used the "About startup" addon to look at startup times, and the "startup.service" addon Christi suggested, and it really improved time measurably.

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@apporv:thank yu – Praveen Apr 15 '11 at 9:36
Good software, sad thing it's OLD. 2005 is the last release date. But seriously.. why there is no way to preload it or something? :( I even use a RAMDISK just for firefox. grr. – Shiki Apr 16 '11 at 19:49

You could also try the Faster Firefox extension. Make sure that you reboot after installing and launch it from the desktop shortcut created by the extension.

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yep..thank yu Christi – Praveen Apr 15 '11 at 9:36
This worked perfectly! – apoorv020 Apr 15 '11 at 14:09
+1. It seems to work. THe site said no re-boot necessary. I re-booted from my usual shortcut and it came up much faster. Thanks. – Xavierjazz Apr 15 '11 at 16:53

CCleaner has options specifically for Firefox, including compacting its SQLite databases. I've found that after a few days of using Firefox, running CCleaner streamlines Firefox startup noticeably.

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@Gareth: I see that you removed my mention of CCleaner's original name, CrapCleaner. I included it because the original name is more descriptive and many people (including myself) still refer to it that way. According to the developer, the name was changed so that people would not be offended, but I've always suspected that Microsoft objected the loudest. – boot13 Apr 15 '11 at 18:20

Try to disable all extensions and see if you still consider it slow. If it's not slow anymore, enable extensions one by one to find the culprit.

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Most of the time, the addons are blameworthy of slow start. You can see the Slow Performing Add-ons list on the official Mozilla site.

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