Extensions for Pale Moon, Firefox & SeaMonkey made by 
JustOff:
Active Stop Button
Stop gif animation with button, context menu or Esc key
Add Bookmark Helper
Add a menuitem 'Add Bookmark Here...' to Bookmarks Menu
Advanced Night Mode
No Restart
Customizable Night Mode for Pale Moon
Age Unlimiter for YouTube
No Restart
Watch age restricted YouTube videos in Pale Moon without signing in
Classic Add-ons Archive
No Restart
Catalog of classic Firefox add-ons created before WebExtensions apocalypse
Close last tab with middle-click
No Restart
Close last tab with middle mouse click
Cookies Exterminator
No Restart
Auto delete cookies, localStorage and IndexedDB objects as soon as they become unused
Dismiss The Overlay
No Restart
Click to close any overlay on any website
Emoji Assistant
No Restart
Emoji cheatsheet extension for Pale Moon
Extension Source Explorer
No Restart
Explore source code of various browsers extensions using CRX Viewer engine
GitHub Web Components Polyfill
No Restart
Ensure that all GitHub scripts are loaded correctly
Greedy Cache
No Restart
Always load scripts, images and styles from browser's cache
HTML5 Media Tuner
No Restart
Selectively disable HTML5 Video/Audio and/or Media Source Extensions, control 60fps and WebM Video
Location-4-Evar
Show status and progress indicators in location bar
Lull The Tabs
No Restart
Unload inactive tabs to free up browser memory
Modify HTTP Response
No Restart
Rewrite HTTP response body using search & replace patterns.
Moonscribe
No Restart
Unofficial Windscribe Proxy Client for Pale Moon
Moon Tester Tool
No Restart
Allows to install any extension, regardless of target application and versions specified in its manifest
Password Backup Tool
No Restart
Export and import your saved passwords
Photobucket Unlocker
No Restart
Unlock access to embedded Photobucket images
Proxy Privacy Ruler
No Restart
Restrict Proxy by Private Windows, Tabs and Domain List
Responsive Bookmarks Toolbar
No Restart
Auto expand folders in Bookmarks Toolbar on mouse hover
Save All Images
Save images from pages and tabs
Scriptlet Doctor
No Restart
Allow inline scripts regardless of site policy
Send Link to Device
No Restart
Send a tab or link to another device using Pale Moon Sync
Smart Preview for Pale Moon forum
No Restart
Quick preview of forum content using a popup frame
Speed Start
No Restart
Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks
View Source In Tab
Open embedded source viewer within tab
WebInstall Ninja
No Restart
Save a copy of XPI packages when installing from the Web
YouTube Lazy Load
No Restart
Prevent YouTube from auto-load and auto-play videos