| Rewrite HTTP Headers | | - | | |
| Remove Clear List Button | | - | | |
| Rehost Image | | - | | |
| Regex Search | | - | | |
| Redirector | | - | | |
| Record Network Activity | | - | | |
| Record Google Search Keywords | | - | | |
| ReDisposition | | - | | |
| Quo Vadis? | | - | | |
| QuickProxy | | - | | |
| Public IP Display | | - | | |
| ProxyToggle | | - | | |
| Proxy Switcher | | - | | |
| Proxy Selector | | - | | |
| ProperLocationBar | | - | | |
| Professor X | | - | | |
| Private Browsing Proxy | | - | | |
| Print Hint | | - | | |
| Poster | | - | | |
| Pinger | | - | | |
| PhZilla | | - | | 未対応 |
| ParseURL | | - | | |
| PageTimer | | - | | |
| Page Performance Test | | - | | |
| PUTAt | | - | | |
| Override User Agent | | - | | |
| OverbiteFF | | - | | |
| OutWit Hub | | - | | |
| OutWit Docs | | - | | |
| OpenDownload2 | | - | | |
| OpenDownload (fixed) | | - | | |
| Open in Browser | | - | | |
| Open Download Manager on Download | | - | | |
| OnlyMySites | | - | | |
| OneClickProxy | | - | | |
| One Click Proxy IP | | - | | |
| NoRedirect | | - | | |
| My Public IP | | - | | |
| Multithreaded Download Manager | | - | | |
| MozRepl | | - | | |
| Modify Header Value | | - | | |
| Modern Download Manager | | - | | |
| Media Stealer | | - | | |
| Mason | | - | | |
| Masking Agent | | - | | |
| Magento Version Check | | - | | |
| MP4 YouTube Downloader | | - | | |
| MM3-ProxySwitch | | - | | |
| MD5 Reborned Hasher | | - | | |
| MA Auto Reload | | - | | |