Max Lin

Watchtrail

隐私政策Privacy Policy

生效日期：2026-10-11

Watchtrail 是由个人开发者 Max Lin（法定姓名 YOUXIANG LIN，下称「我」）发布的浏览器扩展。本政策说明这个扩展如何处理你的数据，适用于 Chrome 应用商店上的 Watchtrail，以及从项目源代码以未打包方式加载的 Watchtrail。

概要

  • 我没有为 Watchtrail 运行任何服务器，收不到你的观看记录、设置或其他任何数据。
  • 你的观看记录只存在你自己的浏览器里。
  • Watchtrail 只和 B 站（bilibili.com）的服务器通信，读取的是你自己的观看历史和 UP 主公开的视频列表。
  • 没有任何统计分析、遥测、广告或追踪，也不出售或转让任何数据。

扩展读取什么

  • 你在 B 站的观看历史。 Watchtrail 在安装时、浏览器启动时、此后每 30 分钟，以及你在弹窗里点「同步」时，向 B 站的历史记录接口请求你的观看历史。请求使用你浏览器里已有的 B 站登录状态（cookie），和你在 B 站网页上打开「历史记录」时浏览器发出的请求相同。返回的内容包括视频标题、封面地址、UP 主名称和 ID、观看进度和观看时间。
  • 播放页上的播放进度。 你在 B 站视频播放页观看时，Watchtrail 读取当前视频的编号、分 P 和播放到的位置，并向 B 站的视频信息接口查询这个视频的标题、时长等公开信息。
  • 列表页上显示了哪些视频。 在 UP 主主页、收藏夹、稍后再看、搜索结果和追番列表页上，Watchtrail 读取页面上视频卡片的编号，用来在封面上画出你的观看进度；在追番列表上，还会读取 B 站自己在卡片上写的那几行说明（例如「看到第 96 话」），避免写出和它重复的内容。它不读取页面上的其他内容。
  • UP 主公开的视频列表。 只有在你打开扩展的「UP 主」页面并点进某位 UP 主时，Watchtrail 才会向 B 站请求这位 UP 主公开发布的视频列表，用来标出哪些看过、哪些没看过。

数据存在哪里

  • 观看记录存在浏览器为这个扩展单独分配的本地数据库（IndexedDB）里，只有这个扩展能访问。
  • UP 主视频列表的缓存、语言设置和同步状态存在浏览器为这个扩展提供的本地存储（chrome.storage.local）里。
  • 以上数据都不会离开你的浏览器，也不会通过浏览器的同步功能上传到你的账号。

什么会发出到网络，发给谁

Watchtrail 只向以下地址发出请求：

  • api.bilibili.com：读取你的观看历史、视频信息和 UP 主公开的视频列表。请求带上你浏览器中已有的 B 站 cookie。
  • *.hdslb.com（B 站的图片服务器）：在扩展的观看记录页上显示视频封面缩略图。请求不带 Referer。

这些请求发给 B 站，由 B 站自己的用户协议和隐私政策约束。Watchtrail 不向 B 站发送任何它从别处获得的数据。除此之外，Watchtrail 不发出任何网络请求。

导出文件

只有在你在扩展的设置页点「导出」时，Watchtrail 才会把全部记录写成一个 JSON 文件，交给浏览器下载，保存到你选择的位置。这个文件由你保管，我无法访问。导入时，扩展只读取你选择的那个文件。

权限说明

  • storage、unlimitedStorage：在本地保存观看记录和设置。记录只增不减，默认配额迟早会不够用。
  • alarms：每 30 分钟同步一次观看历史。
  • 访问 api.bilibili.com 和 *.bilibili.com：读取观看历史，在 B 站列表页的封面上画进度条，在播放页读取播放进度。

统计与追踪

Watchtrail 不包含任何统计分析、崩溃上报、广告或追踪代码，不收集使用数据。

Watchtrail 对从浏览器获得的信息的使用遵守 Chrome 应用商店用户数据政策，包括其中的「有限使用」要求：数据只用于这个扩展向你提供的功能，不用于其他目的，不出售，不转让给任何第三方，不用于广告，也不交给人工阅读。

如何删除数据

  • 在浏览器的扩展管理页移除 Watchtrail，浏览器会同时删除它保存的全部本地数据。
  • 你导出的文件由你自己删除。
  • B 站服务器上的观看历史由 B 站保存，在 B 站的历史记录页管理。

儿童

Watchtrail 不面向儿童，也不在知情的情况下收集任何人的个人信息——它根本不收集数据。

政策变更

如果 Watchtrail 处理数据的方式发生变化，我会在新版本发布之前或发布时更新本政策和生效日期。

联系方式

Max Lin（个人开发者） 邮箱：hi@max1874.com

Effective date: 2026-10-11

Watchtrail is a browser extension published by the individual developer Max Lin (legal name YOUXIANG LIN; "I" below). This policy explains how the extension handles your data. It applies to Watchtrail on the Chrome Web Store and to Watchtrail loaded unpacked from the project's source code.

Summary

  • I run no server for Watchtrail and never receive your watch history, settings or any other data.
  • Your watch history is stored only in your own browser.
  • Watchtrail talks only to bilibili's servers, reading your own watch history and creators' public video lists.
  • There is no analytics, telemetry, advertising or tracking, and no data is sold or transferred.

What the extension reads

  • Your bilibili watch history. When it is installed, when the browser starts, every 30 minutes after that, and when you press Sync in the popup, Watchtrail requests your watch history from bilibili's history endpoint. The request uses the bilibili sign-in your browser already has (its cookies), the same request your browser makes when you open History on bilibili's website. What comes back includes video titles, cover image addresses, creator names and IDs, how far you watched and when.
  • Playback position on video pages. While you watch on a bilibili video page, Watchtrail reads the video's ID, part number and current position, and asks bilibili's video information endpoint for that video's public title and length.
  • Which videos a list page shows. On creator pages, favourites, watch later, search results and followed-anime lists, Watchtrail reads the IDs of the video cards on the page so it can draw your progress on their thumbnails. On followed-anime lists it also reads the lines bilibili itself writes on each card (such as "watched up to episode 96"), so as not to repeat them. It reads nothing else on those pages.
  • Creators' public video lists. Only when you open the extension's Creators view and choose a creator does Watchtrail request that creator's publicly published video list from bilibili, to mark which videos you have and have not watched.

Where data is stored

  • Watch records are kept in a local database (IndexedDB) that your browser assigns to this extension alone.
  • Cached creator video lists, your language choice and sync status are kept in the extension's local storage (chrome.storage.local).
  • None of this leaves your browser, and none of it is uploaded to your account through browser sync.

What goes over the network, and to whom

Watchtrail sends requests only to:

  • api.bilibili.com: to read your watch history, video information and creators' public video lists. Requests carry the bilibili cookies already in your browser.
  • *.hdslb.com (bilibili's image servers): to show cover thumbnails on the extension's history page. These requests carry no referrer.

These requests go to bilibili and are governed by bilibili's own terms and privacy policy. Watchtrail sends bilibili no data obtained from anywhere else. Watchtrail makes no other network requests.

Export files

Only when you press Export on the extension's settings page does Watchtrail write all records to a JSON file and hand it to your browser to download, to a location you choose. The file is yours; I have no access to it. When you import, the extension reads only the file you select.

Permissions

  • storage, unlimitedStorage: to keep watch records and settings locally. The archive only grows, and the default quota would eventually run out.
  • alarms: to sync watch history every 30 minutes.
  • Access to api.bilibili.com and *.bilibili.com: to read watch history, draw progress bars on bilibili's list pages, and read playback position on video pages.

Analytics and tracking

Watchtrail contains no analytics, crash reporting, advertising or tracking code, and collects no usage data.

Watchtrail's use of information received from the browser adheres to the Chrome Web Store User Data Policy, including the Limited Use requirements: data is used only to provide the extension's features to you, for no other purpose; it is not sold, not transferred to any third party, not used for advertising, and not read by humans.

How to delete your data

  • Remove Watchtrail on your browser's extensions page; the browser deletes all of its local data at the same time.
  • Delete any files you exported yourself.
  • Your watch history on bilibili's servers is held by bilibili; manage it on bilibili's History page.

Children

Watchtrail is not directed at children and does not knowingly collect personal information from anyone — it collects none at all.

Changes to this policy

If what Watchtrail does with data changes, I will update this policy and its effective date before or when the new version is released.

Contact

Max Lin (individual developer) Email: hi@max1874.com