Comment 67 for bug 113201

I use FF 2.0.0.1, and my UI is hanging a lot, with a similar (but not the same) cause and symptoms. Please let me know whether you think I should open a new bug.

The cause is that the company I work for now requires all Internet access to be through a proxy, and so I have entered the proxy's details in the "Manual proxy configuration" section of the Connection Settings (as opposed to "Automatic Proxy Configuration URL" which this bug has been about so far).

The symptoms are that most Web page loads cause the UI to hang, even if I have just loaded a page from the same website (as opposed to only pages "with a new DNS", which is what Comment #1 says).

It may be that this is exactly the same underlying issue as reported above but that the proxy I have to use is poorer quality than most. But I don't think the UI should hang even if the proxy is causing trouble.

Typically I will click on a link or type in an address, and then have to wait from 5 seconds to 5 minutes before I get my UI back. This hang time may include very brief lapses - just enough for most of the page to load, for example.

Sometimes a single website will start to work properly for a while, with pages loading quickly and no hanging at all, but it could at any moment regress and start hanging again.

The only entries in my "No Proxy for" section are 'localhost', '127.0.0.1', and one other specific local address, and yet most of my company's websites (both local and public), such as www.atosorigin.com do not have this hanging problem. So presumably the proxy is configured to treat these sites differently (or maybe they're just faster?), and this is being reflected in FF's behaviour.

For the record, I found bug #306922, which seems similar, and has a comment that it may be a duplicate of this one.

I also looked at bug #224447 (from which this one split) and its chain of duplicates bug #188332 and bug #240759, but I don't know how much use those are.