This is a curated list of SEO-related bookmarklets for Chrome, Firefox and others. There is also a separate list for SEO Chrome/Firefox Extensions. For contributions please check this.
🚧️ Work in Progress 🚧️
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SEO-Bookmarket for On-Site SEO Reviews — quickly review various on-page factors such as length of titles & descriptions, number of headings, missing alt-texts, etc.
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OuiSEO — extracts meta, Open-Graph and Twitter Card information.
Open-Source -
Marking header tags H1, H2 & H3 — highlights H1, H2 & H3 on the current page.