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Ignoring Topics:
Hover over a topic and an ignore icon will appear at the end of the topic's row; clicking it will hide the topic, and it will be hidden on subsequent visits to the forum it's in, and on the Recent Unread Topics page.
On the Recent Unread Topics page, an ignore icon will also appear next to the forum a topic is in; clicking it will hide all topics in that forum when browsing Recent Unread Topics.
Unignoring Topics:
If you've accidentally ignored the wrong thing, or if you realise you want to read about insert subject here more than you previously thought, open your browser's right-click/context menu and click "Show ignored topics" under the "Cook'd and Bomb'd Ignore Topics" menu item.
Ignored topics will be displayed and clicking the appropriate ignore icon on them (you may have ignored a topic individually, by forum or both) will unignore them. You can then re-hide ignored topics using the same menu item.
Other Tweaks:
By default, this extension also hides topic page number links in the Recent Unread Topics view and makes topic links go to the first unread post (when available).
This can be configured in its options.