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I'm using Firebug 1.5.2 and while testing a site before production release i can see a huge amount of time consumed by 'Blocking' parts of the requests.
What exactly does the 'Blocking' mean?
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The timing section of the Firefox Network Monitor documentation, "Blocked" is explained as: Time spent in a queue waiting for a network connection. The browser imposes a limit on the number of simultaneous connections that can be made to a single server.
You can check that in the Web Console (Firefox/Tools > Web Developer)m see: https://developer.mozilla.org/Security/MixedContent. If there is a shield icon to the left of the "Site Identity Button" (globe/padlock) on the location/address bar then that means that mixed active content is blocked.
To Disable Content Blocking for Individual Sites in Firefox, Open Firefox. Navigate to the web site you want to disable the content blocking feature for. Click on the shield icon or on the site information icon ( i ). In the site information pane, click on the Turn off Blocking for This Site button.
Mixed content is not blocked: not secureThat page is open to eavesdropping and attacks where your personal data from the site could be stolen.
"Blocking" previously (earlier versions of FireBug) was called "Queuing". It actually means that request is sitting in queue waiting for available connection. As far as I know number of persistent connections by default is limited in last versions of Firefox to 6, IE8 also 6. Earlier it was only 2. It can be changed by user in browser settings.
Also as I know that while javascript file is loading, all other resources (css, images) are blocked
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