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How to install UserScripts:
https://greasyfork.org/en/help/installing-user-scripts

Screenshots:
Default:

Customized on YouTube:

With this script(bolder font and better shadow):


Donate for this script:
- PayPal.Me/kan####ikaku ←You can send me $1 🤗
- Amazon Wish List ←Snacks while coding 😋
- Amazon CPU Tamer ←Enjoy shopping as well 🥳
- Any kind of referral links are also appreciated 🎉

List of my scripts:
- YouTube scripts
- All scripts

Twitter:
@kan####ikaku
#YouTubeBolderSubtitles

Keywords:
Chrome, Firefox, Edge, Safari, Greasemonkey, Tampermonkey, Violentmonkey, UserScript, Extension, Add-on
YouTube subtitles captions cc telop sub font bold bolder font-weight style css visibility readability display change

Screenshots: