What is this:

DanbooruUp is a Firefox extension originally written by unbuffered for use with sites running Danbooru. This thread has links to a version updated for Firefox 3/4.

It adds the choice of uploading to Danbooru to the context menu you get when you right click an image, and presents an upload dialogue with tag completion.

It also adds tag completion to various fields on the website.

The website tag completion is also available as extensions for Chrome and Opera.

The latest version is 0.3.8.

Firefox

Download the extension file and open it with Firefox.

Opera

For Opera 11, download and install the Opera extension.

The next time you load a Danbooru page an update should start. Wait for the '◊' to turn blue, answering 'Allow' when prompted for more space.

Older versions can use the user script for equivalent functionality.

Chrome

Download and install the Chrome extension and confirm the prompts.

This will also add an "Upload to Danbooru" option when right clicking an image.

Keys for the autocompleter popup:

• Enter or click completes the tag,
• Ctrl+Enter or Ctrl+click completes the tag without closing the search popup,
• Insert or Ctrl+E gets related tags for the currently selected tag,
• Right click opens a tag search (Doesn't work for site autocompletion),
• Escape closes the search box.

You can use * as a search wildcard.

Source

The source code can be found at svn://donmai.us/danbooruup/branches/zatchii.

Misc

Translators may be interested in two small scripts that work with Opera or Firefox with Greasemonkey;
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zatchii said:
New version 0.3.8 released. Tell your friends! :p

Adds:

• Firefox 4 compatibility
• Option to download image from source instead of uploading from local copy.
• Extra tag types for other boorus.
• Packaged as extensions for Chrome and Opera to ease installation and circumvent the quota issue.
• "Upload to Danbooru" context menu option in Chrome.
• Some minor bugfixes

I had to disable threading in Firefox 4, so the GUI might be a tiny bit more sluggish.

The site autocompletion doesn't get along with *.imouto.org built-in autocompleter, so you'll probably want to disable the site injection if you're using it there.

To use danbooruup exclusively for 3dbooru add http://behoimi.org/post/create.xml under Danbooru Sites and remove the others, replace the update url with http://behoimi.org/tag/index.xml and hit update now.