| Search Multi Tabs | | - | | |
| Search History with Search Engine | | - | | |
| Search Engine Sorting | | - | | |
| Search Engine Creator | | - | | |
| Search Engine Changer | | - | | |
| Search Bar Auto-Clean | | - | | |
| Sea Containers | | - | | |
| Scrollmap | | - | | |
| Scrollbar Search Highlighter | | - | | |
| Scrollbar Auto Show／Hide | | - | | |
| Scroll Search Engines | | - | | |
| Scriptlet | | - | | |
| Scientific Calculator | | - | | |
| SaveMyTabs | | - | | |
| SaveAS | | - | | |
| Save Tabs | | - | | |
| Save Page WE | | - | | |
| Save My Tabs | | - | | |
| Save All Tab URLs | | - | | |
| Saka | | - | | |
| SB Tab Replace | | - | | |
| Roomy Bookmarks Toolbar | | - | | |
| RightBar | | - | | |
| Right-Aligned Bookmarks Bar | | - | | |
| Right Click Opens Link New Tab Correct Order | | - | | |
| Reuse Tab | | - | | |
| Restore empty favicon | | - | | |
| Restore View Source for Firefox 6+ | | - | | |
| Restore Open_External | | - | | |
| Restore Control | | - | | |
| ResizeIT 2 | | - | | |
| ResetSearchbar | | - | | |
| Reset Search Timer | | - | | |
| Replacetabs Extension | | - | | |
| Replace All in Tabs | | - | | |
| Reopen Tab Quickly | | - | | |
| Reopen Tab Pro | | - | | |
| Rename Tab Title | | - | | |
| RemoveTabs | | - | | |
| Remove Resizer | | - | | |
| Remove New Tab Button | | - | | |
| Removable Tabs | | - | | |
| ReloadMatic | | - | | |
| ReloadAll! | | - | | |
| Reload page in URL bar | | - | | |
| Reload on Idle | | - | | |
| Reload non-pinned tabs | | - | | |
| Reload in address bar | | - | | |
| Reload Without Cache | | - | | |
| Reload Tabs Button | | - | | |
