Even before websites had RSS feeds on them, people followed their websites by bookmarking pages on their browser. Even today, I have several webpages bookmarked on my browser.
Anyone with several bookmarks on a browser might be familiar with the issue of some bookmarks becoming defunct (bad links) or even being saved multiple times. Bookmark Sentry is an extension, that allows users to scan Chrome bookmarks for bad links and duplicate links.
Bookmark Sentry Features
As this extension works only on Chrome, you might like these cool tips to get more out of your Chrome browser.
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Link: Bookmark Sentry