Block websites from automatically entering fullscreen mode but allow F11
// ==UserScript==
// @name Nuclear Fullscreen Blocker (F11 Allowed) - Fixed
// @namespace http://tampermonkey.net/
// @version 1.3
// @description Block websites from automatically entering fullscreen mode but allow F11
// @author You
// @match *://*/*
// @run-at document-start
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Block fullscreen requests by overriding the fullscreen API
function blockFullscreen() {
// Override Element.requestFullscreen
const originalRequestFullscreen = Element.prototype.requestFullscreen;
Element.prototype.requestFullscreen = function() {
console.log('Fullscreen request blocked by Nuclear Fullscreen Blocker');
return Promise.reject(new Error('Automatic fullscreen blocked by user script'));
};
// Override browser-specific fullscreen methods
const methods = [
'webkitRequestFullscreen',
'mozRequestFullScreen',
'msRequestFullscreen'
];
methods.forEach(method => {
if (Element.prototype[method]) {
Element.prototype[method] = function() {
console.log('Fullscreen request blocked by Nuclear Fullscreen Blocker');
return Promise.reject(new Error('Automatic fullscreen blocked by user script'));
};
}
});
// Allow exitFullscreen to work normally
const originalExitFullscreen = Document.prototype.exitFullscreen;
if (originalExitFullscreen) {
Document.prototype.exitFullscreen = function() {
return originalExitFullscreen.call(this);
};
}
// Also allow browser-specific exit methods
const exitMethods = [
'webkitExitFullscreen',
'mozCancelFullScreen',
'msExitFullscreen'
];
exitMethods.forEach(method => {
if (Document.prototype[method]) {
const originalMethod = Document.prototype[method];
Document.prototype[method] = function() {
return originalMethod.call(this);
};
}
});
}
// Block keyboard shortcuts that websites use for fullscreen
function blockFullscreenShortcuts() {
document.addEventListener('keydown', function(e) {
// Block common website fullscreen shortcuts but allow F11
const blockedShortcuts = [
// Ctrl/Cmd + Enter
(e.ctrlKey || e.metaKey) && e.key === 'Enter',
// 'f' key on video elements
(e.target.tagName === 'VIDEO' || e.target.tagName === 'AUDIO') && (e.key === 'f' || e.key === 'F'),
// Space bar on video elements (might trigger fullscreen)
(e.target.tagName === 'VIDEO' || e.target.tagName === 'AUDIO') && e.key === ' ' && !e.ctrlKey && !e.metaKey
];
if (blockedShortcuts.some(condition => condition)) {
e.preventDefault();
e.stopImmediatePropagation();
console.log('Fullscreen shortcut blocked');
return false;
}
}, true);
}
// Block fullscreen via click events on buttons/elements
function blockFullscreenClicks() {
document.addEventListener('click', function(e) {
const target = e.target;
// Check if this might be a fullscreen button
if (target.hasAttribute('onclick') &&
target.getAttribute('onclick').includes('fullscreen')) {
e.preventDefault();
e.stopImmediatePropagation();
console.log('Fullscreen click blocked');
return false;
}
}, true);
}
// Initialize everything
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', function() {
blockFullscreen();
blockFullscreenShortcuts();
blockFullscreenClicks();
});
} else {
blockFullscreen();
blockFullscreenShortcuts();
blockFullscreenClicks();
}
// Re-block if new content is added dynamically
const observer = new MutationObserver(function(mutations) {
let shouldReBlock = false;
mutations.forEach(function(mutation) {
if (mutation.addedNodes.length > 0) {
shouldReBlock = true;
}
});
if (shouldReBlock) {
setTimeout(blockFullscreen, 50);
}
});
if (document.body) {
observer.observe(document.body, {
childList: true,
subtree: true
});
}
console.log('Nuclear Fullscreen Blocker activated - F11 fullscreen is allowed');
})();