A bookmarklet is JavaScript code that has been "transformed" into a URL. You can set up a bookmark with the code as its URL and opening the bookmark will then execute the code.
To quickly create the Bookmark, just right-click the bookmarks bar and add a new one. Choose a name and then copy and paste the code from bookmarklet_URL.txt into the location of your new bookmark.
| javascript:(function()%7Bconst%20audios%20%3D%20document.querySelectorAll('audio,video,media')%3Bif%20(audios.length)%20%7Bconst%20newSpeedStr%20%3D%20prompt('How%20fast%20do%20you%20want%20the%20media%20to%20be%3F',2)%3Bconst%20newSpeed%20%3D%20parseFloat(newSpeedStr)%3Bif%20(!Number.isNaN(newSpeed)%20%26%26%20newSpeed%20%3E%200)%20%7Baudios.forEach(audio%20%3D%3E%20%7B%20audio.playbackRate%20%3D%20newSpeed%20%7D)%3Bconsole.info(%60Successfully%20changed%20the%20speed%20of%20%24%7Baudios.length%7D%20media!%60)%3B%7D%20else%20%7Balert(%60%24%7BnewSpeedStr%7D%20not%20a%20valid%20speed!%20Please%20enter%20a%20positive%20number%20(preferably%20no%20larger%20than%205)!%60)%3Bconsole.log(%7B%20newSpeedStr%2C%20newSpeed%2C%20audios%20%7D)%3B%7D%7D%20else%20%7Balert('No%20media%20found!')%3B%7D%7D)() |
| const audios = document.querySelectorAll('audio,video,media'); | |
| if (audios.length) { | |
| const newSpeedStr = prompt('How fast do you want the media to be?', 2); | |
| const newSpeed = parseFloat(newSpeedStr); | |
| if (!Number.isNaN(newSpeed) && newSpeed > 0) { | |
| audios.forEach(audio => { audio.playbackRate = newSpeed }); | |
| console.info(`Successfully changed the speed of ${audios.length} media!`); | |
| } else { | |
| alert(`${newSpeedStr} not a valid speed! Please enter a positive number (preferably no larger than 5)!`); | |
| console.log({ newSpeedStr, newSpeed, audios }); | |
| } | |
| } else { | |
| alert('No media found!'); | |
| } |