20 Essential Tweaks and Tips Every Firefox User Should Know
Advanced Spell Checking

Firefox’s built-in spell checker is useful for using web content management systems like Wordpress for blog entries or Google docs, but the default setting only spellchecks fields that are bigger than one line. Enable single-line spellcheking (like for Google searches) by changing the following preference in about:config: layout.spellcheckDefault = 2
Additionally, you can add different language dictionaries to the spell-check database by picking and installing the right packages from Mozilla’s language packs page. Right click any multi-line text field and you can choose to alternate between different languages for spell checking.
And in case you’ve ever unintentionally added a word to the Dictionary, you can remove the entry by opening the persdict.dat file stored in your user Profile directory. Using a text editor like notepad, delete the line containing your unwanted word, and save the file.
14 Essential Keyboard Shortcuts
- Ctrl+T – Open a new tab
- Ctrl + Tab – Next tab
- Ctrl + 1-9 – Jump to a specific tab
- Ctrl+W -- Close the current tab
- Ctrl+N – Open a new window
- Alt+Home – Go to your home page
- Ctrl + R – Refresh the current page. F5 also works
- Ctrl + Shift + R – Refresh the current page after flushing its current cache
- Ctrl+F – Find specific text in the current page. You can also use /
- Ctrl+D – Bookmark the current page
- Spacebar – Scroll a page down
- Shift+Spacebar – Scroll a page up
- Ctrl+K – Put the cursor in the search field
- Ctrl+L – Put the cursor in the location bar
Make Websites Work and Look the Way You Want
Browse websites the way you want. Use the Greasemonkey add-on with user-created scripts to automate and customize the way the way websites behave and look. You can make MP3 file links play with an in-line MP3 player, or make Google display Twitter search results at the top of all search pages. There are thousands of Greasemonkey scripts that you can use, and they’re all free to download.
Stylish lets you easily employ themes (called Styles) for any website without having to mess with CSS code. Like Greasemonkey, there is a sizeable database of preconfigured styles that users have created for you to try.
Disguise Firefox as Internet Explorer or an iPhone
Even if you don’t want to run Internet Explorer, there are some web services that only work if you use Microsoft’s browser (such as web outlook or Windows Update). IE Tab gives you the option to render pages using Internet Explorer or open new tabs using the IE engine. You can make specific sites always open with IE Tab as well.
User Agent Switcher is an add-on that doesn’t change the rendering engine, but allows you to make Firefox pretend to be a different browser when it retrieves information from a server. For example, you can have Firefox pose as an iPhone to view mobile-specific pages.