1px: Simple ruler Extension You can measure the size of any element (width and height). To exit, press the ' ESC ' button or the extension button.Perhaps in the future some more useful functions will be added, but now only such functionality. Read more
Source Manifest.json { "background": { "persistent": false, "scripts": [ "background.js" ] }, "browser_action": { "default_title": "__MSG_name__" }, "default_locale": "en", "description": "__MSG_description__", "icons": { "16": "ico_16_mono.png", "48": "ico_48.png", "128": "ico_128.png" }, "manifest_version": 2, "name": "__MSG_name__", "short_name": "__MSG_short_name__", "permissions": [ "activeTab" ], "update_url": "https://clients2.google.com/service/update2/crx", "version": "1.0.1"} Read more