tabs.removeCSS()

Removes from a page CSS which was previously injected by a call to tabs.insertCSS().

This is an asynchronous function that returns a Promise.

Syntax

var removing = browser.tabs.removeCSS(
  tabId,           // optional integer
  details          // object
)

Parameters

tabId Optional

integer. The ID of the tab from which to remove the CSS. Defaults to the active tab of the current window.

details

An object describing the CSS to remove from the page. It contains the following properties:

 

allFramesOptional

boolean. If true, the code will be removed from all frames of the current page. If it is false, code is only removed from the top frame. Defaults to false.

codeOptional

string. CSS to remove, as a text string. This must exactly match a CSS string previously inserted into the page using tabs.insertCSS().

fileOptional

string. Path to a file containing the CSS to remove. This must exactly match a CSS file previously inserted into the page using tabs.insertCSS().

frameIdOptional

integer. The frame from which to remove the CSS. Defaults to 0 (the top-level frame).

matchAboutBlankOptional

boolean. If true, the CSS will be removed from embedded "about:blank" and "about:srcdoc" frames if your extension has access to their parent document. Defaults to false.

Return value

A Promise that will be fulfilled with no arguments when all the CSS has been removed. If any error occurs, the promise will be rejected with an error message.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Examples

This example adds some CSS using tabs.insertCSS, then removes it again when the user clicks a browser action:

var css = "body { border: 20px dotted pink; }";
function onError(error) {
  console.log(`Error: ${error}`);
}
var insertingCSS = browser.tabs.insertCSS(2, {code: css});
insertingCSS.then(null, onError);
browser.browserAction.onClicked.addListener(() => {
  var removing = browser.tabs.removeCSS(2, {code: css});
  removing.then(null, onError);
});

Example extensions

• apply-css

// Copyright 2015 The Chromium Authors. All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
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//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.