Multiple word highlighting - Add multiple words/phrases to be highlighted, each with individual settings
Per-word options: Case sensitivity (Aa button) - Toggle case-sensitive matching for each word Whole word matching (W button) - Toggle between matching anywhere vs. standalone words only
Individual colors - Each word can have its own highlight and text colors
Per-site control - Enable/disable each word on specific websites
Right-click context menu - Select any text and right-click to access highlighting options: Add to highlights (Permanent) - Add words to your saved highlight list Add to highlights (Until refresh) - Highlight all instances temporarily Highlight this instance only - Highlight just the selected occurrence (great for studying) Remove highlight (temporary) - Remove temporary or single-instance highlights
Single-instance highlighting - Highlight only one specific occurrence of text, not all matches
Perfect for studying or marking specific passages
Keyboard shortcut support (default: Alt+H, customizable)
Toggle behavior: press shortcut again on highlighted text to remove it
Customizable keyboard shortcuts - Configure your own shortcut for single-instance highlighting via the settings panel
Auto-save - All changes are saved and applied automatically
Collapsible sections - Temporary highlight colors section can be collapsed to save space
Expandable word items - Click on a word to expand and customize its colors
Scrollable word list - View and manage all your highlighted words in a scrollable list
Enable/disable toggle - Quickly turn highlighting on or off
Dynamic content support - Uses MutationObserver to highlight text in dynamically loaded content
Persistent settings - Settings are saved using browser.storage.local

yshkon

Published Firefox add-on:

Text Highlighter