tab thumbnail userchromejs in javascript

To tab the thumbnail in UserChromeJS, you can use the getBrowser() method to get the current browser window and then access the gBrowser property to get the current tab object. Then use the linkedBrowser property to get the current browser object of the tab, and finally takeScreenshot() method of browser object to take the snapshot of the current tab.

Here's the code:


index.tsx
let browser = window.getBrowser();
let tab = browser.selectedTab;
let browserObj = tab.linkedBrowser;

let canvas = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
let context = canvas.getContext("2d");

let thumbnailWidth = 256;
let thumbnailHeight = 256;
canvas.width = thumbnailWidth;
canvas.height = thumbnailHeight;

let tabRect = tab.getBoundingClientRect();

let offsetX = tabRect.left + window.mozInnerScreenX;
let offsetY = tabRect.top + window.mozInnerScreenY;

context.drawWindow(browserObj.contentWindow, offsetX, offsetY, thumbnailWidth, thumbnailHeight, "rgb(255,255,255)");

let thumbnailUrl = canvas.toDataURL();
console.log(thumbnailUrl);
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This code will take the screenshot of the current tab and assign it to a variable thumbnailUrl in a base64 encoded string format. You can use this variable to display the thumbnail of the current tab in your UserChromeJS script.

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