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Accessibility features in Firefox - Make Firefox and web content work for all users

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Àtúnyẹ̀wò 862 lọ́wọ Chris_Ilias ní

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Firefox includes many features to make the browser and web content accessible to all users, including those who have low vision, no vision, or limited ability to use a keyboard or mouse.

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<!-- Contributors: Mark Pilgrim (original author) --> Firefox includes many features to make the browser and web content accessible to all users, including those who have low vision, no vision, or limited ability to use a keyboard or mouse. __TOC__ = Using a Keyboard = == Keyboard Shortcuts == A list of common keyboard shortcuts is available in [[Keyboard shortcuts|Firefox Keyboard Shortcuts]]. == Always use the cursor keys to navigate within webpages == [[Options window - Advanced panel#accessibility|Always use the cursor keys to navigate within webpages]] allows you to move through web content as if you were inside a read-only editor. You can use the keyboard to select web content and copy it to the clipboard. You can enable this feature by selecting {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, opening the ''General'' tab in the ''Advanced'' panel, and checking the ''Always use the cursor keys to navigate within webpages'' {for win}option{/for}{for mac,linux}preference{/for}. You can press {key F7} at any time to turn this feature on or off. When you press {key F7}, Firefox will ask if you really want to turn on this feature. You can disable this prompt by selecting ''Do not show this dialog again.'' == Search for text when I start typing == [[Options window - Advanced panel#accessibility|Search for text when I start typing]] allows you to quickly navigate to text or hyperlinks in a web page. This feature has two modes. Press {key /} and start typing to search all text on the current page, or press {key '} before your string to search hyperlinks only. Firefox will highlight matching text or hyperlinks as you type. The following keyboard shortcuts control this feature: * Type more characters to narrow your search. Firefox will highlight the next matching hyperlink or text or alert you that nothing matched. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key G} or {key F3} to find the next occurrence of your current search string. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key Shift}+{key G} or {key Shift}+{key F3} to find the previous occurrence of your current search string. * Press {key Backspace} to undo the last character you typed. Firefox will back up to the previously highlighted text. * Press {key Esc} to cancel a search. You can also cancel a search by changing focus, or simply waiting for the timeout. You can change the default behavior of this feature by selecting {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, opening the ''Advanced'' panel, selecting the ''General'' tab, and checking the ''Search for text when I start typing'' {for win}option{/for}{for mac,linux}preference{/for}. If this option is checked, you can start typing at any time to auto-start an inline search. By default auto-started searches look for all text on the page. You can still explicitly press {key '} or {key /} to start finding in one mode or the other. You can use this feature to get to buttons, text boxes and other form controls. Search for the text immediately before the form control you want and press {key Tab}. Pressing {key Tab} automatically exits the search and sets focus to the next form field or button after the highlighted text. == HTML Access Keys == On some web pages, keyboard shortcuts are assigned to different elements on the page. To move the cursor directly to one of these elements, press {for win,linux}{key Shift}+{key Alt}{/for}{for mac}{key Ctrl}{/for}+''AccessKey''. * Which key ''AccessKey'' is depends on the website. It is determined by the website author, not Firefox. = Using a Mouse = == Common Mouse Shortcuts == A list of common mouse shortcuts is available in [[Mouse shortcuts|Firefox Mouse Shortcuts]]. {for fx3} = Page zoom = You can zoom in and out of pages including images, in the {menu View > Zoom} menu, or with the following keyboard shortcuts: * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key +} to display the web page one size larger. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key -} to display the web page one size smaller. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key 0} (zero) to display the web page at its normal size. {/for} = Fonts and Colors = == Overriding Page Fonts == Some websites may display text in fonts that are difficult to read, and other sites may rely on the browser's default fonts. You can set your default fonts by going to {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, selecting the ''Content'' panel, and selecting a default font and size in the ''Fonts & Colors'' section. You can specify default fonts for different styles, including serif, sans-serif, and monospace by clicking the ''Advanced'' button. However, many web pages specify their own fonts, so your choices will have no effect on such pages. To override the fonts defined by such pages, uncheck the ''Allow pages to choose their own fonts, instead of my selections above'' {for win}option{/for}{for mac,linux}preference{/for}. Note that some web pages may display incorrectly depending on your choice of a default font. == Setting a Minimum Font Size == Some websites may display text which is too small to read comfortably. To make such pages easier to read, you can set a minimum font size. On web pages that try to display text smaller than this size, Firefox will enlarge the text to your chosen size. To set a minimum font size, go to {for win}{menu Tools > Options}{/for}{for linux} {menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, select the ''Content'' panel, and click the ''Advanced'' button in the ''Fonts & Colors'' section. You can specify a minimum font size from the dropdown menu. Note that some web pages may display incorrectly depending on your choice of a minimum font size. == Resizing Page Text == {for fx3} You can temporarily change the size of text on any web page in the {menu View > Zoom} menu, with {menu Zoom Text Only} enabled. {/for} The following keyboard shortcuts control text size: * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key +} to increase the text size. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key -} to decrease the text size. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key 0} (zero) to reset the text size to the web page's default size. Note that some web pages may display incorrectly if you increase or decrease the text size. == Overriding Page Colors == Some websites may display text and background colors that are difficult to read, and other sites may rely on the browser's default colors. You can set your default colors by going to {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, selecting the ''Content'' panel, and clicking the ''Colors'' button in the ''Fonts & Colors'' section. You can set default text and background colors, as well as default colors for visited and unvisited hyperlinks. You can also specify whether hyperlinks should be underlined. However, many web pages set their own colors, so your choices will have no effect. To override the colors defined by web pages, uncheck the ''Allow pages to choose their own colors, instead of my selections above'' {for win}option{/for}{for mac,linux}preference{/for}. == Using a High Contrast Theme == Firefox automatically detects if you are using a High Contrast theme and displays everything in your high contrast color scheme. This overrides all other other browser or web page settings, and it affects the Firefox interface itself (all menus, windows, and dialog boxes) and the content of any web page you visit. {for win} To use a High Contrast theme, go to {menu Start Menu > Control Panel > Accessibility Options > Display} and check the ''Use High Contrast'' {for win}option{/for}{for mac,linux}preference{/for}. {/for} = Controlling Web Content = == Blocking Pop-up Windows == See [[Pop-up blocker|Controlling Pop-ups]] for information on blocking pop-up windows. == Turning Off Java Applets == Some web pages provide a rich interactive experience with Java™ applets. However, some users that rely on keyboard navigation may experience problems with some Java applets that automatically set focus and do not provide a way to break out of the applet and navigate to the rest of the web page. If this is a problem for you, you can disable Java by going to Tools > Add-ons, selecting the ''Plugins'' panel, selecting the Java item(s) in the list, and then clicking {button Disable}. == Restricting JavaScript Behavior == You can turn off JavaScript entirely by going to {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, selecting the ''Content'' panel, and unchecking ''Enable JavaScript''. Some web pages rely on JavaScript and may not work properly if JavaScript is disabled. If you do not wish to disable JavaScript entirely, there are also a number of advanced JavaScript settings to restrict the behavior of scripts. Immediately after the ''Enable JavaScript'' checkbox, click the ''Advanced'' button to open the ''Advanced JavaScript Settings'' window. You can control whether scripts are allowed to move or resize existing windows, raise or lower windows, disable or replace context menus, hide the status bar, or change status bar text. = Compatibility With Assistive Technologies = The latest information about compatibility with third-party assistive technologies is at [[Assistive technology compatibility]]. = Finding Help Online = {for win}Freedom Scientific maintains a number of [http://www.freedomscientific.com/fs_support/User_Groups.asp mailing lists for JAWS users]. GW Micro maintains a number of [http://www.gwmicro.com/Support/Email_Lists/ mailing lists for Window Eyes users].{/for} You may {for win}also{/for} post accessibility questions to the [http://support.mozilla.com/forum Firefox Support forum].
<!-- Contributors: Mark Pilgrim (original author) --> Firefox includes many features to make the browser and web content accessible to all users, including those who have low vision, no vision, or limited ability to use a keyboard or mouse. __TOC__ = Using a Keyboard = == Keyboard Shortcuts == A list of common keyboard shortcuts is available in [[Keyboard shortcuts|Firefox Keyboard Shortcuts]]. == Always use the cursor keys to navigate within webpages == [[Options window - Advanced panel#accessibility|Always use the cursor keys to navigate within webpages]] allows you to move through web content as if you were inside a read-only editor. You can use the keyboard to select web content and copy it to the clipboard. You can enable this feature by selecting {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, opening the ''General'' tab in the ''Advanced'' panel, and checking the ''Always use the cursor keys to navigate within webpages'' {for win}option{/for}{for mac,linux}preference{/for}. You can press {key F7} at any time to turn this feature on or off. When you press {key F7}, Firefox will ask if you really want to turn on this feature. You can disable this prompt by selecting ''Do not show this dialog again.'' == Search for text when I start typing == [[Options window - Advanced panel#accessibility|Search for text when I start typing]] allows you to quickly navigate to text or hyperlinks in a web page. This feature has two modes. Press {key /} and start typing to search all text on the current page, or press {key '} before your string to search hyperlinks only. Firefox will highlight matching text or hyperlinks as you type. The following keyboard shortcuts control this feature: * Type more characters to narrow your search. Firefox will highlight the next matching hyperlink or text or alert you that nothing matched. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key G} or {key F3} to find the next occurrence of your current search string. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key Shift}+{key G} or {key Shift}+{key F3} to find the previous occurrence of your current search string. * Press {key Backspace} to undo the last character you typed. Firefox will back up to the previously highlighted text. * Press {key Esc} to cancel a search. You can also cancel a search by changing focus, or simply waiting for the timeout. You can change the default behavior of this feature by selecting {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, opening the ''Advanced'' panel, selecting the ''General'' tab, and checking the ''Search for text when I start typing'' {for win}option{/for}{for mac,linux}preference{/for}. If this option is checked, you can start typing at any time to auto-start an inline search. By default auto-started searches look for all text on the page. You can still explicitly press {key '} or {key /} to start finding in one mode or the other. You can use this feature to get to buttons, text boxes and other form controls. Search for the text immediately before the form control you want and press {key Tab}. Pressing {key Tab} automatically exits the search and sets focus to the next form field or button after the highlighted text. == HTML Access Keys == On some web pages, keyboard shortcuts are assigned to different elements on the page. To move the cursor directly to one of these elements, press {for win,linux}{key Shift}+{key Alt}{/for}{for mac}{key Ctrl}{/for}+''AccessKey''. * Which key ''AccessKey'' is depends on the website. It is determined by the website author, not Firefox. = Using a Mouse = == Common Mouse Shortcuts == A list of common mouse shortcuts is available in [[Mouse shortcuts|Firefox Mouse Shortcuts]]. {for fx3} = Page zoom = You can zoom in and out of pages including images, in the {menu View > Zoom} menu, or with the following keyboard shortcuts: * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key +} to display the web page one size larger. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key -} to display the web page one size smaller. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key 0} (zero) to display the web page at its normal size. {/for} = Fonts and Colors = == Overriding Page Fonts == Some websites may display text in fonts that are difficult to read, and other sites may rely on the browser's default fonts. You can set your default fonts by going to {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, selecting the ''Content'' panel, and selecting a default font and size in the ''Fonts & Colors'' section. You can specify default fonts for different styles, including serif, sans-serif, and monospace by clicking the ''Advanced'' button. However, many web pages specify their own fonts, so your choices will have no effect on such pages. To override the fonts defined by such pages, uncheck the ''Allow pages to choose their own fonts, instead of my selections above'' {for win}option{/for}{for mac,linux}preference{/for}. Note that some web pages may display incorrectly depending on your choice of a default font. == Setting a Minimum Font Size == Some websites may display text which is too small to read comfortably. To make such pages easier to read, you can set a minimum font size. On web pages that try to display text smaller than this size, Firefox will enlarge the text to your chosen size. To set a minimum font size, go to {for win}{menu Tools > Options}{/for}{for linux} {menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, select the ''Content'' panel, and click the ''Advanced'' button in the ''Fonts & Colors'' section. You can specify a minimum font size from the dropdown menu. Note that some web pages may display incorrectly depending on your choice of a minimum font size. == Resizing Page Text == {for fx3} You can temporarily change the size of text on any web page in the {menu View > Zoom} menu, with {menu Zoom Text Only} enabled. {/for} The following keyboard shortcuts control text size: * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key &#43;} to increase the text size. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key -} to decrease the text size. * Press {for win,linux}{key Ctrl}{/for}{for mac}{key command}{/for}+{key 0} (zero) to reset the text size to the web page's default size. Note that some web pages may display incorrectly if you increase or decrease the text size. == Overriding Page Colors == Some websites may display text and background colors that are difficult to read, and other sites may rely on the browser's default colors. You can set your default colors by going to {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, selecting the ''Content'' panel, and clicking the ''Colors'' button in the ''Fonts & Colors'' section. You can set default text and background colors, as well as default colors for visited and unvisited hyperlinks. You can also specify whether hyperlinks should be underlined. However, many web pages set their own colors, so your choices will have no effect. To override the colors defined by web pages, uncheck the ''Allow pages to choose their own colors, instead of my selections above'' {for win}option{/for}{for mac,linux}preference{/for}. == Using a High Contrast Theme == Firefox automatically detects if you are using a High Contrast theme and displays everything in your high contrast color scheme. This overrides all other other browser or web page settings, and it affects the Firefox interface itself (all menus, windows, and dialog boxes) and the content of any web page you visit. {for win} To use a High Contrast theme, go to {menu Start Menu > Control Panel > Accessibility Options > Display} and check the ''Use High Contrast'' {for win}option{/for}{for mac,linux}preference{/for}. {/for} = Controlling Web Content = == Blocking Pop-up Windows == See [[Pop-up blocker|Controlling Pop-ups]] for information on blocking pop-up windows. == Turning Off Java Applets == Some web pages provide a rich interactive experience with Java™ applets. However, some users that rely on keyboard navigation may experience problems with some Java applets that automatically set focus and do not provide a way to break out of the applet and navigate to the rest of the web page. If this is a problem for you, you can disable Java by going to Tools > Add-ons, selecting the ''Plugins'' panel, selecting the Java item(s) in the list, and then clicking {button Disable}. == Restricting JavaScript Behavior == You can turn off JavaScript entirely by going to {for win}{menu Tools > Options}{/for}{for linux}{menu Edit > Preferences}{/for}{for mac}{menu Firefox > Preferences}{/for}, selecting the ''Content'' panel, and unchecking ''Enable JavaScript''. Some web pages rely on JavaScript and may not work properly if JavaScript is disabled. If you do not wish to disable JavaScript entirely, there are also a number of advanced JavaScript settings to restrict the behavior of scripts. Immediately after the ''Enable JavaScript'' checkbox, click the ''Advanced'' button to open the ''Advanced JavaScript Settings'' window. You can control whether scripts are allowed to move or resize existing windows, raise or lower windows, disable or replace context menus, hide the status bar, or change status bar text. = Compatibility With Assistive Technologies = The latest information about compatibility with third-party assistive technologies is at [[Assistive technology compatibility]]. = Finding Help Online = {for win}Freedom Scientific maintains a number of [http://www.freedomscientific.com/fs_support/User_Groups.asp mailing lists for JAWS users]. GW Micro maintains a number of [http://www.gwmicro.com/Support/Email_Lists/ mailing lists for Window Eyes users].{/for} You may {for win}also{/for} post accessibility questions to the [http://support.mozilla.com/forum Firefox Support forum].

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