Estilos de navegador

Certain user interface components - browser and page action popups, sidebars, and options pages - are specified by your extension in essentially the same way:

  1. create an HTML file defining the structure of the UI element
  2. add a manifest.json key (browser_action, page_action, sidebar_action, or options_ui) pointing to that HTML file.

One of the challenges with this approach is styling the element in such a way that it fits in with the browser's own style. To help with this, the manifest.json keys include an extra optional property: browser_style. If this is included and set to true, then your document will get one or more extra stylesheets that will help make it look consistent with the browser's UI and with other extensions that use the browser_style property.

In Firefox, the stylesheet can be seen at chrome://browser/content/extension.css. The extra stylesheet at chrome://browser/content/extension-mac.css is also included on OS X.

Most styles are automatically applied, but some elements require you to add the non-​standard browser-style class to get their styling since Firefox 55, as detailed in the table below:

Elemento Exemplo
<button> 
<button class="browser-style">Click me</button>
    This API has not been standardized.

<select>

 
<select class="browser-style" name="select">
  <option value="value1">Value 1</option>
  <option value="value2" selected>Value 2</option>
  <option value="value3">Value 3</option>
</select>
<textarea> 
<textarea class="browser-style">Write here</textarea>
Parent of an <input> 
<div class="browser-style">
  <input type="radio" id="op1" name="choices" value="op1">
  <label for="op1">Option 1</label>

  <input type="radio" id="op2" name="choices" value="op2">
  <label for="op2">Option 2</label>
</div>

Compatibilidade de navegador

No compatibility data found for webextensions.browser_style.
Check for problems with this page or contribute missing data to mdn/browser-compat-data.

Componentes de Painel do Firefox

This API has not been standardized. Non-Standard
This feature is non-standard and only works in Firefox.

The chrome://browser/content/extension.css stylesheet also contains the styles for the Firefox Panel Components.

The legacy Firefox Style Guide documents proper usage.

Elemento Exemplo
Cabeçalho 
<header class="panel-section panel-section-header">
  <div class="icon-section-header"><img src="image.svg"/></div>
  <div class="text-section-header">Header</div>
</header>
Rodapé 
<footer class="panel-section panel-section-footer">
  <button class="panel-section-footer-button">Cancel</button>
  <div class="panel-section-footer-separator"></div>
  <button class="panel-section-footer-button default">Confirm</button>
</footer>
Separadores 
<div class="panel-section panel-section-tabs">
  <button class="panel-section-tabs-button selected">Tab</button>
  <div class="panel-section-tabs-separator"></div>
  <button class="panel-section-tabs-button">Tab</button>
  <div class="panel-section-tabs-separator"></div>
  <button class="panel-section-tabs-button">Tab</button>
</div>
Form 
<div class="panel-section panel-section-formElements">
  <div class="panel-formElements-item">
    <label for="name01">Label:</label>
    <input type="text" value="Name" id="name01" />
  </div>
  <div class="panel-formElements-item">
    <label for="picker01">Label:</label>
    <select id="picker01">
      <option value="value1" selected="true">Dropdown</option>
      <option value="value2">List Item</option>
      <option value="value3">List Item</option>
    </select>
  </div>
  <div class="panel-formElements-item">
    <label for="placeholder01">Label:</label>
    <input type="text" placeholder="Placeholder" id="placeholder01" />
    <button name="expander" class="expander"></button>
  </div>
</div>
Menu 
<div class="panel-section panel-section-list">
  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut">Ctrl-L</div>
  </div>

  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut"></div>
  </div>

  <div class="panel-section-separator"></div>

  <div class="panel-list-item disabled">
    <div class="icon"></div>
    <div class="text">Disabled List Item</div>
    <div class="text-shortcut"></div>
  </div>

  <div class="panel-section-separator"></div>

  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut"></div>
  </div>

  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut"></div>
  </div>
</div>

Exemplo

HTML

<header class="panel-section panel-section-header">
  <div class="icon-section-header"><!-- An image goes here. --></div>
  <div class="text-section-header">Header</div>
</header>

<div class="panel-section panel-section-list">
  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut">Ctrl-L</div>
  </div>

  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut"></div>
  </div>

  <div class="panel-section-separator"></div>

  <div class="panel-list-item disabled">
    <div class="icon"></div>
    <div class="text">Disabled List Item</div>
    <div class="text-shortcut"></div>
  </div>

  <div class="panel-section-separator"></div>

  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut"></div>
  </div>

  <div class="panel-list-item">
    <div class="icon"></div>
    <div class="text">List Item</div>
    <div class="text-shortcut"></div>
  </div>
</div>

<footer class="panel-section panel-section-footer">
  <button class="panel-section-footer-button">Cancel</button>
  <div class="panel-section-footer-separator"></div>
  <button class="panel-section-footer-button default">Confirm</button>
</footer>

Result