This is my first major programming experience. And I really hope the fruits of labor will be edible to someone.
Well, please love and favor: 
StatisFire is a 
lame plugin for quickly displaying a heap of various statistics.
Here is what the visible part of the popup looks like:

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And if more. Clicking on the icon, you can find out:
Standard puzomerki:
Check site availability in directories:
- DMOZ
 - Yandex catalog (availability, as well as the assigned region and "source" of content)
 
Number of backlinks by:
Social references to:
- Twitter
 - Facebook
 - Vk
 - Google plus
 - Delicious
 
Overall site traffic rating:
- Alexa
 - Webomer
 - JAPP (for blogs)
 - Compete
 
From all sorts of things:
- Errors from w3c-validator
 - The presence of the file / robots.txt
 - The presence of the site file /sitemap.txt
 
Learn something about the audience:
- The number of unikas in the last 24 hours (liveinternet)
 - The number of unikas for today (liveinternet)
 - Number of friends per week (liveinternet)
 - Number of users per month (liveinternet, webomer)
 - Kernel size - regular site visitors (webomer)
 - Audience coverage (webomer)
 - The share of search engines in site traffic (webomer)
 - Gender distribution of audience (webomer)
 
Indexing page:
- Is the current page in the Yandex index
 - Is the current page in Google index
 - Is the current page in the Bing index
 - Is the current page in index yahoo
 
Site Indexing:
- Number of pages indexed by Google
 - Number of indexed pages on the site by Yandex
 - Number of indexed pages Bing site
 - The number of indexed pages of the site Yahu
 
Huiz:
- Ipishnik
 - Where is the server
 - Server type
 - Domain Release Date
 - Domain Registration Date
 
Attendance schedules from:
One of the goals was maximum customizability. So the display of any parameter is disabled.

I draw your attention to the fact that at the same time information can be displayed both for the current page and for the main domain as a whole.
The icon is also functional. Shows PageRank or TCI (customizable).
Future plans:
- Much better looking
 - Cache the results
 - Highlight nofollow, noindex
 - Display statistics on the search result pages of all Google and Yandex
 - Show more, more, more statistics
 
I appeal to leave feedback:
- What parameters do you want to see added?
 - From what other sites can you parse sensible statistics ?.
 - What is missing in the first place?
 
Well, I hope my first job was not done in vain, and for some it will come in handy.