Alternatives to Extensions Manager
Similar tools and alternatives in the Browser Tools & Bookmarklets category
Original Tool
Extensions Manager🔓 Open Source Alternatives to Extensions Manager
23 open source alternatives
AMP Browser Extension
Instantly validates Accelerated Mobile Pages and provides real-time debugging for web developers
Dark Reader
Enables dark mode for every website to reduce eye strain during long SEO audit sessions
Wappalyzer
Identify web technologies on websites including CMS frameworks and payment processors
Dimensions
A tool for designers to measure screen dimensions in the browser for pixel perfect layouts
JSONView
Formats and validates JSON responses in the browser for easier API and structured data debugging
EditThisCookie
Manage cookies for SEO testing including location spoofing and session management.
Tab Manager Plus
Efficiently manage hundreds of tabs with search filter and deduplication features
LinkClump
Allows you to open copy or bookmark multiple links at once by dragging a selection box
WhatFont
The easiest way to identify fonts on web pages by simply hovering over the text
CSP Evaluator
Evaluates Content Security Policies to detect bypasses and improve site security
Linkclump
Drag a box around links to open them all in new tabs or copy them to clipboard
Clear Cache
One-click cache and data clearing to test live SEO changes without browser lag.
Check My Links
Link crawler that finds broken links on a webpage to assist in technical SEO cleanup
Clear Cache Shortcut
One-click button to clear browser cache and cookies for testing fresh site changes
Eye Dropper
Color picker that allows you to pick colors from any webpage or color picker interface
Quick Source Viewer
A refined view of the page source with syntax highlighting and resource grouping
Copy All URLs
Quickly copy all open tab URLs to the clipboard in multiple formats for research sharing
Page Load Time
Minimalist extension that displays the exact loading time of a webpage in the browser toolbar
Alt Text Tester
Hover over images to see their alt text and identify missing attributes for accessibility
View Image Info
Extracts image metadata including alt text, file size, and dimensions directly from the browser.
Word Counter Plus
Simple tool to count words and characters in selected text on any web page
NoFollow Simple
Highlights all nofollow and sponsored links on a page to visualize internal link equity
Simple URL Copy
One-click to copy current URL or all URLs from a window with clean formatting
💚 Free Alternatives to Extensions Manager
15 free alternatives
Session Buddy
Unified session and tab manager to save and export groups of SEO research tabs
Ayima Page Insights
Highlight on-page SEO issues directly on the page including hidden content and alt text.
Robots Exclusion Checker
Visual indicator of robots.txt and meta-robots directives to prevent accidental deindexing.
Open SEO Stats
Shows web rank and SEO stats for the current page including backlinks and indexed pages
Structured Data Testing Tool
Validator for Schema.org and JSON-LD markup that simulates Google's rich results
ColorZilla
Advanced eyedropper and color picker for analyzing website color schemes for design and SEO
Core Web Vitals Overlay
Visualizes LCP FID and CLS metrics directly on the page for real-time performance tuning
Open Graph Preview
Visualizes how your website will appear on social media platforms like Facebook and Twitter
Portent's SEO Page Review
Review meta data and on-page content relevance with a focus on marketing intent
OAuth 2.0 Playground
Test and debug OAuth 2.0 APIs for Google Search Console and Analytics integrations.
Web Developer Overlay
Adds a toolbar to the browser with various web developer tools for accessibility and SEO testing
Meta SEO Inspector
Inspects metadata and microdata for errors and compliance with search engine guidelines
Schema Builder
Point-and-click tool to generate complex JSON-LD schema markup without writing code
Google Optimize (Legacy Check)
Visual editor for A/B testing although sunsetted many bookmarklets still use its logic
Link Redirect Trace
The "all-in-one" redirect path analyzer that covers headers rel-canonicals and more
💼 Commercial Alternatives to Extensions Manager
12 commercial alternatives
Ghostery
Privacy extension that shows trackers and allows you to block them to see page speed impact
MozBar
SEO toolbar that provides instant metrics like Domain Authority and Page Authority
KeySearch Starter
A browser-based keyword tool for identifying low competition niches and related search terms
Fonts Ninja
Identify fonts used on any website and inspect CSS properties like size and spacing
Mobile Simulator
Test your website responsive design across dozens of mobile devices and tablet screen sizes
Data Miner
Scrape data from any website into Google Sheets or Excel with one click
Full Page Screen Capture
Capture high-resolution full-page screenshots of entire websites with one click
Hunter - Email Finder
Find email addresses associated with the website you are visiting for outreach campaigns
Koala Inspector
Spy on Shopify stores to see used themes apps and newest products for e-commerce SEO
VPN Proxy Master
Switch locations to see localized SERP results and test regional SEO performance
BuiltWith Technology Profiler
Displays all technologies used on a site including tracking pixels and hosting providers
Ahrefs SEO Toolbar
On-page SEO report broken link checker and link metrics for visited pages