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().

cssOriginOptional

string. This can take one of two values: "user", for CSS added as a user stylesheet, or "author" for CSS added as an author stylesheet. If this option was set previously by tabs.insertCSS(), then it must exactly match.

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.

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
• beastify

Browser compatibility