Although the main type of content provided by Web pages is HTML, many other content types can be displayed, played, or presented by a Web browser. Most additional data encountered by the browser is handled by plug-ins.

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Applications that help Firefox display content, such as a Flash plug-in, used to be called Helper Apps. If you are migrating from the Mozilla suite, these helper applications are now called extensions or plug-ins (both names are used). Plug-ins are self-contained programs that allow data to play within the Mozilla window.

At the time you open a Web page and data of a specific type is encountered, the browser evaluates the data based on the following criteria, and then launches the appropriate plug-in. Suffixes - If the browser is reading a file that has a particular extension (such as.exefor an application or .gz for a compressed zip file), it can use that suffix to determine the file's contents. When a file's extension matches a suffix configured for a particular plug-in, the plug-in is used to play or display the data.

MIME type - Because data may come to the browser in a stream or have no suffix, the browser can use the Multipurpose Internet Mail Extensions (MIME) type attached to the data to determine which plug-in to use.

Here are some of the most popular extensions to Firefox that are available from Mozilla·org:
Downloading tool (FlashGot) - If you like to download groups of files from your Web browser, FlashGot can be a very useful tool. With FlashGot installed, you can select to download an individual file, files identified by highlighting links on a Web page, or all files linked from the current Web page. There is also a Build Gallery feature that lets you identify a range of filenames to download at once.

When FlashGot is installed, you can access it from Firefox by selecting Tools FlashGot and then choosing a feature from the menu. In Fedora, FlashGot passes requests to kGet to complete the download. You can get other download tools to use instead of kGet.

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