YASP - Yet Another SEO Plugin

YASP — a professional on-page SEO analyzer with PageSpeed ​​Insights YASP is a lightweight and convenient extension for quick page audits right in the browser. It analyzes key on-page factors, highlights problem areas, checks hreflang, collects microdata (JSON-LD/Microdata/OG/Twitter), helps quickly open Wayback/WHOIS, and integrates with Google PageSpeed ​​Insights (Lighthouse: Performance, Accessibility, Best Practices, SEO). What it does SEO summary for the current tab Title, Description, Keywords (if any), length, and quality status. Canonical URL (rel="canonical") and validation. Robots meta directives and X-Robots-Tag header (noindex/nofollow, etc.). Page language (<html lang>) and Publisher/OG Site Name (if any). Word count on a page (text density assessment). Heading structure Number of H1…H6. Quick copying of a list of headings. Heading highlighting on a live page (on/off). Links Collecting all links, identifying external/internal ones. Detecting rel="nofollow". Highlighting links (on/off) and copying the list to the clipboard. Images List of images, basic statistics. Detecting missing/empty alt tags. Indexing and infrastructure Quick links to robots.txt and sitemap.xml of the current site. Indexability assessment based on meta tags/headers. Hreflang audit Collecting all <link rel="alternate" hreflang="…"> tags. Checking the HTTP status of final URLs (using a HEAD request). Attempt to determine a backlink to the current page: a content script loads the HTML for the target locale and looks for hreflang pointing back to the current URL and language. Microdata Open Graph and Twitter Card from meta tags. JSON-LD: parsing scripts <script type="application/ld+json"> — processing both arrays and single objects. Microdata (itemscope, itemtype, itemprop) with property tree construction, including nested structures. PageSpeed ​​Insights Run a Lighthouse audit for the current URL (via API). Displays total Performance / Accessibility / Best Practices / SEO scores (0–100) and a brief status. SEO Practitioner Tools (1-Click) site:domain.com — instant site search query in Google. site:domain.com inurl:… — URL filter for the site. Wayback Machine — open the site's history. WHOIS — quickly view domain data. Detects the CMS on the page (WordPress, Joomla, Drupal, Shopify, Wix, etc.) by meta tags/resource paths/generators. Attempts to extract the version (if available). Noindex/nofollow highlighting Search for <!--noindex-->…<!--/noindex--> blocks and visual highlighting. Separate highlighting for rel="nofollow". Site JavaScript switcher On-the-fly enables/disables JavaScript for the current domain via chrome.contentSettings.javascript (with status indication). Amenities Dark/light theme. Localizations: EN / RU / UK (auto-detection based on browser language). Settings (language, theme) are saved in chrome.storage. Why this is convenient for SEO specialists Instant overview of key factors without switching to third-party services. Live on-page highlighting instead of "dry" reports. Quick shortcuts (site:, Wayback, WHOIS). Hreflang checking with a backlink test is a rare feature. Built-in Lighthouse checking via PageSpeed ​​Insights. 🧠 Keyword Density & Content Analysis The new Keyword Density Analyzer module calculates the frequency and distribution of keywords across the visible text of a page. It helps identify over-optimized or under-used phrases, supporting natural SEO balance and content quality evaluation. Features: Extraction and counting of all significant words on the page (ignores HTML tags, stop-words, and scripts). Exporting Keywords Data to csv. Multilingual stop-word filtering (EN / RU / UK / DE / ES / GR / IT). Per-word frequency statistics and density percentage (%). Visualization of the most frequent words via interactive table or highlight overlay. Helps detect keyword stuffing and content imbalance. Ideal for copywriters and on-page SEO professionals auditing keyword usage. 🧩 What’s New Version 1.8.2 introduces: Character Counter — instantly count characters (with and without spaces) and words from any selected text right from the context menu. Quick Shortcuts — access the main SEO tools (header highlighting, link detection, Google search helpers, WHOIS, Web Archive) faster with keyboard shortcuts in the context menu.