When it comes to Firefox’s plugins, everyone have their own preferences. For me, these are the ones that I like and use the most and according to me are useful for all web-developers are:
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Sometimes, when you search in google for something, you find very nice results but when you visit those sites, they seem to be protected i.e; you need to either sign-up or maybe you need to pay for it. So, here’s a way to get access to it without paying or even signing up.

Mostly people want their exclusive content to be protected. Since it is exclusive, they would want people to know about it so that more people join the site. That is why they let search engines to access their protected content so that it gets listed in their results and site gets traffic for that. Now search engines are similar to people. Websites only have one way to differentiate between them – User agents. All the search engines have user agents which makes them differentiate from humans.
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Recently, I got a project to make an ad system for a website. The ad system was such that, when the page displaying ad was loaded for the first time, it would create a random link and store them in database. From then on, it would display the same link on same page.

So, I made a javascript file which would create and xmlobject for AJAX request. It would query php file on a server and get the link. But cross domain AJAX just doesn’t work. I tried to edit some parts of it, but it just wouldn’t work. Cross domain ajax requests aren’t allowed for security purposes.

So I had to think of something else. First I thought of renaming php file to js and then addind a code to .htaccess to make it behave like php. Then I thought of making image links dynamically using php’s GD library.
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