i agree with firefox being better... the web developer extension is really great... thanks for the list of other extensions... the seo extension looks promising...
i use firefox, it is just great, lots of extensions, i like SEO Quake, Search Status, IE Tab (to make sure i never have to open IE ).
I use Opera mainly nowadays. On the websites where I do not have to rely on external content (such as rss), I usually head off to www.w3c.org and use their html validator and css validator. Many diss those 2 tools but i've found that having good clean code will be viewable in all browsers and from experience, i've had a great pickup in traffic from search engines when I converted sites to clean compliant code.
What's the one plugin the let's you crawl like you a Google useragent? I'm needing that for something. Thanks
you can do it without a plugin if you want... about:config -> new string -> general.useragent.override -> enter what you want as your useragent. or this: https://addons.mozilla.org/firefox/59/