Shajirr

This addon allows you to hide artworks of specific users by adding them to a blacklist.

Block YouTube videos based on video Title / ID / Channel name

Loads tabs sequentially one by one or in batches to reduce lag and reduce time until you get the first tab(s) fully loaded. Can also be used to just open tabs in a discarded state.

Automatically opens tabs in either temporary or permanent containers for domain isolation.

Addon counts the daily opened and closed tabs, displays count delta on the addon's toolbar icon, and count deltas for the last 7 days in a popup. Can also suggest a list of the oldest tabs to close.

When a new tab is opened or tab URL changes, existing tabs with the same URL are automatically closed.

Discards pinned tabs on browser start.

A Firefox add-on to fetch, display, edit, randomize and export/import Reddit comments.

Limits the number of loaded tabs, unloading the oldest ones when the limit is reached. Has optional timer-based discarding, as well as KB/popup shortcuts for manual discarding.

After you close a tab, switches to another tab from the same domain according to user-defined rules.

This addon can display visited sites history in form of a 3D node graph, which can be used to open previously visited pages, or quickly delete selected visited links from history.