Chrome //
Extensions 
Chrome
Web store
select chrome_id_no,plugin_tag_line,plugin_name,plugin_icon,sitemap_url,oldvsnew_comment from final_chrome_totaldata_sept2022 where MATCH(plugin_name) AGAINST('+checker +error' IN Boolean MODE) order by users desc
HTML Error Checker
Check the HTML for error. This doesn't send the source to the external. If web page behavior is not correct, you should turn off it.
website broken link and 404 error checker
A SEO tool to fast find all broken links on your websites to Rank Higher.