@Ste_W @Mark_S I use Stylus for this. I basically play with my browser’s Inspector tool to fiddle with the CSS and then save anything I want changed to the extension to make them (semi-)permanent. For instance, I just noticed I had missed grayscaling emojis. A cursory check shows that they are neatly coded with an “emoji” class, so I just need to add the following to my CSS override:
img.emoji {
filter: grayscale(1);
}
I have a few more, which you’ll find attached here: LessStimulatingTWDiscourse.css.tid (601 Bytes). It’s attached as a fake .tid because .css aren’t accepted as a valid attachment but you can simply open the file and copy-paste them into Stylus. Stylus has live preview, so you can also drop them one by one and see which ones you find useful without having to get down to the bottom of every single line.