10 Useful Firefox Developer Tools You Should Know

www.hongkiat.com hongkiat.com3 years ago in #Dev Love408

Firefox being “developer’s browser” has many great tools to help make our work easier. You can find more on its tool collection on the Firefox Developer Tools webpage and can also try their Developer Edition Browser which has more features and tools that are being tested. For this post, I’ve listed 10 handy tools you might like from its developer tools collection. I’ve also demonstrated what these tools can do with GIFs plus how to access them for quick reference. Read Also: 40 Firefox Add-ons For Better Productivity 1. View horizontal and vertical rulers Although the Firefox toolbar lets you take screenshots of the full page or visible portions, in my opinion the CSS selector method is more useful for capturing screenshots of individual elements as well as for elements that are visible on mouse-hover only (like menus). To take screenshots through the menu: Go to ☰ > Developer > Developer Toolbar (shortcutShift + F2). Once the toolbar appears at the bottom of the page, type screenshot –selector any_unique_css_selector. Press enter. To make this appear on the developer tools window: Click “Toolbox Options” and under “Available Toolbox Buttons” section. Check “Take a fullpage screenshot” checkbox. 3. Pick colors from web pages Firefox has a built-in color picker tool by the name of “Eyedropper”. To access the “Eyedropper” tool through menu go to ☰ > Developer > Eyedropper. To make this appear on the developer tools window: click “Toolbox Options” and under “Available Toolbox Buttons” section check “Grab a color from the page” checkbox. 4. View page layout in 3D Viewing webpages in 3D helps with layout problems. You’ll be able to see the different layered elements much more clearly in 3D view. To view the webpage in 3D, click the “3D View” tool button. To make this appear on the developer tools window, click “Toolbox Options” and under “Available Toolbox Buttons” section check the”3D View” checkbox. 5. View browser style Browser Styles consist of two types: the default style a browser assigns for every element, and the browser-specific styles (the ones with the browser prefix). By taking a look at the browser styles you’ll be able to diagnose any override issues in your stylesheet and also come to know of any existing browser specific styles . To access “Browser styles” through menu: Go to ☰ > Developer > Inspector. Click the “Computed” tab in the right section. Check the “Browser styles” checkbox. You can also open the “Inspector” tab through the shortcut Ctrl +Shift + C and then accessing “Browser styles”. 6. Disable JavaScript for current session For best practice and screen reader compatibility it is always advised to code any website in such a way that its functionality is not hindered in a javascript-disabled environment. To test for such environments, you can disable the JavaScript for the session you’re working in. To disable JavaScript for current session click “Toolbox Options” and under “Advanced settings” section check the “Disable JavaScript*” checkbox. 7. Hide CSS style from the page Just like JavaScript, due to accessibility concerns it is best to design websites in such a way that the pages should still be readable even without any styles. To see how the page looks without any style, you can disable them in the developer tools. To remove any CSS style (inline, internal or external) applied on a webpage, just click on the eye symbol of the listed stylesheets in the “Style Editor” tab. Click it again to revert to the original view. To access “Style Editor” through menu go to ☰ > Developer > Style Editor (shortcut: Shift + F7. 8. Preview the…

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