Check out the web developer extension for Firefox, if you’re interested in building standards compliant sites, this is the tool for the job.
| Disable | Delete Domain Cookies | Deletes all cookies for this domain |
| Disable Cookies | Disables cookies | |
| Disable Images | Disables images | |
| Disable Java | Disables Java | |
| Disable JavaScript | Disables JavaScript | |
| Disable Page Colors | Disables page colors | |
| Disable Referrer Logging | Disables referrer logging | |
| Disable Styles | Disables all style sheets | |
| Forms | Convert GETs To POSTs | Converts all forms with GET methods to POST methods |
| Convert POSTs To GETs | Converts all forms with POST methods to GET methods | |
| Display Form Details | Displays the form method and action as well as all the form element’s IDs and names for all forms | |
| Enable Auto Completion | Enables auto-completion on all forms that have it disabled | |
| Show Passwords | Shows all passwords as text | |
| View Form Information | Displays form information | |
| Images | Display Image Dimensions | Displays the width and height of all images on the page |
| Display Image Paths | Displays the path of all images on the page | |
| Find Broken Images | Finds all broken images | |
| Hide Images | Hides all images | |
| Make Images Invisible | Makes all images invisible, but the images still take up their original space on the page | |
| Outline Images Without Alt Attributes | Outlines any image without an alt attribute | |
| Outline Images Without Title Attributes | Outlines any image without a title attribute | |
| Replace Images With Alt Attributes | Replaces any image with it’s alt attribute | |
| Information | View Cookie Information | Displays all cookies |
| View CSS | Displays the style sheets | |
| View Page Information | Opens the page info dialog | |
| View Response Headers | Displays the response headers | |
| View Speed Report | Displays a speed report using the Web Site Optimization service | |
| View Style Information | Displays the styles applied to the selected element
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| W3C Documents | Provides links to various W3C documents | |
| Miscellaneous | Add User Style Sheet | Adds a user selected style sheet to the page |
| Clear Cache | Clears the browser cache | |
| Clear HTTP Authentication | Clears the browser HTTP authentication | |
| Edit CSS | Opens the CSS of the page in a sidebar for live editing
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| Open Java Console | Opens the Java console | |
| Open JavaScript Console | Opens the JavaScript console | |
| View ID & Class Details | Displays the ID and class of all elements on the page | |
| Visited Links | Mark all links visited or unvisited | |
| Zoom | Zoom the page in or out | |
| Outline | Outline Block Level Elements | Outlines all block level elements and indicates the element type |
| Outline Deprecated Elements | Outlines all elements deprecated in HTML 4.0 | |
| Outline Frames | Outlines all frames | |
| Outline Links Without Title Attributes | Outlines any link without a title attribute | |
| Outline Table Cells | Outlines all table cells | |
| Outline Custom Elements… | Outlines all custom elements specified by the user | |
| Resize | Display Current Size | Displays the current window and viewport size |
| Custom Size… | Resizes the browser window to a custom size specified by the user | |
| Validation | Validate CSS | Validates the CSS of a page using the W3C validation service |
| Validate HTML | Validates the HTML of a page using the W3C validation service | |
| Validate Links | Validates all the links on the page | |
| Validate Section 508 Accessibility | Validates the accessibility of a page against the Section 508 accessibility guidelines using the Cynthia validator | |
| Validate WAI Accessibility | Validates the accessibility a page against the WAI accessibility guidelines using the Cynthia validator | |
| Validate Local CSS | Validates the CSS of a page stored locally using the W3C validation service | |
| Validate Local HTML | Validates the HTML of a page stored locally using the WDG validation service | |
| Custom Validator | Validates the page using a custom validator specified by the user | |
| View Source | View Source | Displays the page source |
| Options | Persist Styles | Persist the Web Developer extension styles when the page changes |
| Reset Page | Resets the Web Developer extension styles and refreshes the page | |
| Options… | Displays the options dialog |
