Pixiv User Filter od Shajirr

This addon allows you to exclude artworks of specific users from showing up in Recommendations section as well as tag pages by adding said users to a blacklist.
Their artworks will be simply hidden. The addon will display a counter to show how many artworks it removed.

Supported pages

• Artwork pages (pixiv.net/en/artworks/<ID>)
• Tag pages (pixiv.net/en/tags/<tag>)
• Artwork search pages (pixiv.net/search?q=<search_term>&s_mode=tag&type=artwork)
• Home (pixiv.net)
• Illustrations (pixiv.net/illustration) - partial support
• Manga (pixiv.net/manga) - partial support

Additional functions

• Exclude the artworks of the author on who's page you are currently on from the Recommendations.
• Restore proper uncropped artwork thumbnails, in their original aspect ratio.
• Limit the number of recommendations shown.

Usage instructions:

• Clicking the addon icon on the toolbar opens the addon's Options page
• To add a user to a blacklist, right click a link to a user's profile,
  which would be in a format like "www.pixiv.net/en/users/<user_ID>",
  go to "Pixiv User Filter" -> "Add User to Blacklist". Removing a user from blacklist
  can be done in a similar way, just choose the option "Remove User from Blacklist" instead.
• Another way to add/remove users to a blacklist is to edit it directly in the addon's
  Options page, by manually adding/removing the user ID(s). The format of the list
  is each user ID on a new line. Click Save button to save the changes.
• A floating counter shows how many artworks were removed on the current page, by default its located in the bottom-left corner. You can drag the counter to any position on the page, and its new location will be saved.
• Addon icon on the toolbar also shows the same counter of removed artworks.
• If you also want to remove the artworks of the user who's artwork you are viewing
  currently from its Recommendations section, check the appropriate checkbox
  in addon's Options page.
• "Restore proper uncropped thumbnails" allows you to uncrop the thumbnails and display them in full, in original aspect ratio. Idea from the "Improve Pixiv thumbnails" userscript.
• "Limit the number of recommendations" - does just that. By default Pixiv loads up to 180 recommendations in batches of 18, slider is also divided by increments of 18 images to match that. Can set 0 to block all recommendations. Using this option not just hides recommendations but blocks loading requests entirely, so blocked images won't be loaded at all.

Backup
* Export Blacklist button allows you to quickly save the current blacklist as a .txt file.
* You can create manual backups of your blacklist+settings, which will be saved as a .json files, as well as restore them via 'Save Backup' and 'Load Backup' buttons.
* Addon automatically creates hourly / daily / weekly / monthly backups in Firefox's default download location, at: '[FF-addon-backups] / [Pxv.UF-backups]'. It will retain the last 4 hourly backups, and 3 of each other category.
* If there are no changes in the backup data compared to the previous state for the same backup type, then its simply skipped.
* Addon uses Downloads history to track its backups. If you wipe it, the addon will lose reference to existing backup files and won't be able to auto-delete them, so you'll need to remove them manually at some point if they aren't needed.

Bugs / Issues / Suggestions can be reported / posted on GitHub

Suggestions / Ideas / not yet implemented

• Extend blocking functionality to the Discovery page
• Extend full blocking support to Illustrations / Manga pages

Known issues: