I’m reverse engineering the Tab Snooze extension. This extension lets you “close unnecessary tabs and make them magically reappear when you need them.”

Here is the file system for this extension. I downloaded the files using Chrome Extension Source Viewer.

Looking in the manifest.json file, it requires the following permissions:

"permissions": [
        "tabs",
        "alarms",
        "storage",
        "notifications",
        "idle",
        "<all_urls>"
    ]

It has a browser action which ‘snoozes’ the current tab and background script ‘background.js’ that uses the jquery and moment.js libraries. The content-script.js creates an angular.js app (which I don’t know anything about) that handles the majority of the extension’s functionality. I believe the background.js script has functions that deal with getting info from or changing the browser. It contains functions such as getting all existing tabs or creating a new tab.

The manifest.json also includes the commands API which lets you create keyboard commands. Each command references a function defined in background.js. 

"commands": {
        "_execute_browser_action": {
            "suggested_key": {
                "default": "Alt+S"
            },
            "description": "Snooze active tab"
        },
        "repeat_last_snooze": {
            "suggested_key": {
                "default": "Alt+Shift+S"
            },
            "description": "Repeat last snooze action"
        },
        "open_snoozed_list": {
            "suggested_key": {
                "default": "Alt+Shift+L"
            },
            "description": "Open snoozed tabs list"
        },
        "new_todo_page": {
            "suggested_key": {
                "default": "Ctrl+Shift+1"
            },
            "description": "New todo tab",
            "global": true
        }
    }