登录缓存保护器 (Login Cache Protector)

Login Cache Protector helps preserve sign-in state for websites you choose to protect by backing up the browser data many sites depend on to recognize that you are already logged in. Based on the extension package, its purpose is not to manage passwords or accounts, but to protect login-related cookies and website storage so a selected site can recover more smoothly after browsing data is cleared or session information is lost. For users who regularly clean browser data or run into unexpected sign-outs, this creates a more controlled way to maintain continuity on important websites.

The extension uses a selective protection model. When you add a website to the protected list, it saves the site’s normalized base domain and immediately creates a backup of its current cookies. It also attempts to capture localStorage and sessionStorage from open tabs for that site, helping retain site-specific state that may be important for login continuity. Later, when you revisit a protected site, the extension tries to restore cookies before the page fully loads so the website can see expected authentication data as early as possible. At the same time, a content script can restore missing storage entries early in the page lifecycle when a backup exists and the current storage is empty. If needed, the page may reload once so the restored values can be read correctly.

A key strength shown in the package is its defensive backup logic. The extension does not simply replace saved data every time something changes. It includes checks to avoid overwriting a good backup with an empty cookie set or with conditions that resemble a logged-out state, such as session-related cookies disappearing. Similar safeguards are applied to localStorage and sessionStorage so an existing backup is not replaced by an empty snapshot. This design improves resilience in the situations the extension is meant to address, especially after browser data has been wiped or a site’s session state changes unexpectedly.

Control is available through a popup interface that shows the current website and allows one-click protection or removal from protection. The popup also includes actions for immediate backup, immediate restore, and restoring all protected sites. Status indicators summarize whether the current site is protected, how many cookies are backed up, how many cookies are currently present, and whether site storage has been saved. If the extension detects that a protected site has backup data but currently has no live cookies, it can surface a restore hint for quick recovery. The protected sites list also shows stored entries, backup-related counts, and recent backup timing, with an undo-style action when removing a site.

The package also shows support for browser context menu actions, notifications, badge indicators, scheduled background tasks, and cookie change listeners. It attempts to restore cookie settings such as path, secure flag, HTTP-only flag, same-site behavior, expiration for persistent cookies, and partition information where available, while avoiding already expired cookies and retrying with simplified settings if needed. Domain handling is normalized to improve consistency across common subdomain patterns.

Key Features:
- One-click protection for selected websites from the popup or context menu.
- Local backup of cookies for protected domains, with attempts to support partitioned cookies when available.
- Backup and restoration of localStorage and sessionStorage for protected sites.
- Early restore behavior that tries to recover cookies and storage before the site fully initializes.
- Smart safeguards that avoid replacing a valid backup with empty data or likely logged-out state.
- Popup tools for immediate backup, immediate restore, restore all, and protected site management.
- Badge indicators, notifications, scheduled tasks, and cookie change monitoring for ongoing support.

How It Works:
1. Open a website where you are signed in and choose to protect it from the popup or browser context menu.
2. The extension saves the site’s normalized base domain in a protected list and creates an initial cookie backup.
3. It attempts to capture localStorage and sessionStorage from open tabs for that site.
4. On future visits to the protected site, it tries to restore cookies before the page fully loads.
5. If the page opens with empty local storage and a saved backup exists, it restores missing entries and may reload the page once.
6. Background alarms and cookie change listeners help keep backups updated while avoiding accidental replacement with weaker data.
7. You can manually back up, restore the current site, restore all protected sites, or remove a site from protection at any time.

Privacy: - The extension stores protected domain lists, cookie backups, and storage backups in local browser storage. The package indicates this data is saved locally rather than sent externally.