overflowy/hn-comment-saver

HN Comment Saver is a Firefox extension for people who read Hacker News and want to keep track of comments worth remembering. It adds a save link to every comment header on HN pages, threads, item pages, permalinks, and the new comments feed. Click it once to save a comment, click again to remove it. A toolbar button opens a manager where all saved comments live. The manager includes a proper search box. You can search by plain words with prefix and typo tolerance, or use exact phrase matching with quotes. There are also targeted filters: search by tag, by author, within a thread title, within your own notes, or within the comment body only. Results are ranked by relevance and matches get highlighted in place, including highlights inside your notes. You can select any text inside a saved comment and attach a note to it. The selected passage gets a dashed underline, and the note appears in a list below the comment with options to edit or delete it. Comments can also be tagged with comma separated labels for organizing your collection later. Everything is stored locally in the browser using IndexedDB. Comment content is compressed to save space and only decompressed when you view or export it, while a small plain text copy stays available for fast searching. The extension automatically writes a backup file to your Downloads folder once a day, keeping one file per day of the week so backups never pile up endlessly. You can also trigger a manual backup, and any backup file can be re-imported later. Importing a file merges new comments and tags with what you already have rather than overwriting anything. The extension makes no network requests of its own and only runs on the Hacker News website, so nothing you save leaves your machine. It is released under the MIT license. Installation is done through the Firefox add-ons store.