AdBlock Plus is a very useful Firefox extension. Except when you're laying out a page containing some ads, and spend ages wondering why the images are displaying properly in IE, but not in FF.
Flash has this concept called "cross domain policy", which basically means that you can't get Flash to read files from a server other than the one it's hosted on unless there's an explicit permission thingummy set up on it.
Which is all very sensible unless you're a contractor developing software for someone else's site at which point it bites you in the @ss every time! (The downloads in question fail silently, so you need to remember why - it won't tell you.)
Doh! That's similar to someone I know who wondered why the website he'd just spent ages updating wasn't showing the changes, until he realised he hadn't uploaded it yet!
I remember spending ages puzzled once because I'd forgotten I has the SessionSaver extension installed on the version of FF that I was using - couldn't figure out why my changes weren't showing.
I once spent a morning trying to spot a mistake in a dynamic page, only to discover that Firefox's "View Source" doesn't show the current source, but goes back to the server and fetches a new copy of the page. You have to install a plugin to view the source of the page you're actually looking at right now.
The Web Developer extension includes a useful feature "View Generated Source", which similarly shows you the source that's actually in the browser (allegedly).
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Flash has this concept called "cross domain policy", which basically means that you can't get Flash to read files from a server other than the one it's hosted on unless there's an explicit permission thingummy set up on it.
Which is all very sensible unless you're a contractor developing software for someone else's site at which point it bites you in the @ss every time! (The downloads in question fail silently, so you need to remember why - it won't tell you.)
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