This is a userscript that provides a networkwide flag summary for all Stack Exchange sites.
If you are logged into the Stack Exchange network and you have this script installed, you can visit the flags tab in your Stack Exchange profile:
How does it work?
The script scans your network profile for all Stack Exchange accounts you created. For each account it tries to access the flag summary page. Since that page is private, i.e. only visible to you (and mods), you need be logged in. From there it extracts the flag summary of the individual site and sums it all up in a generated table.
The table can be sorted ascending & descending by clicking on the desired column label.
You can find a link to the global flag summary on each per-site flag summary page.
Install
Tested with Greasemonkey & Tampermonkey on Firefox
Changelog
v1.1 Request rate and error handling improvements.
v1.0 Including all Meta sites; Greasemonkey 4.0 support.
v0.8 Fixed Area51 URL; Added site count with progress; Improved sorting.
v0.7 Fixed meta sites and HTTPS links; Enumerated table rows.
v0.6 Changed helpful % formula to helpful / (helpful + declined) * 100; Support for meta sites (limited) and Area 51.
v0.5 Initial release.