[reportgunner]

1. Click somewhere on the page so the scrolling works

2. Hold down Ctrl + End until a desired amount of pages loads

3. Ctrl + F to find $string

[Aachen]

That's what I used to do but sites like Twitter unload content to not make your browser tab super slow (which is a good thing in general), which breaks ctrl+f.

[egeozcan]

Which is useless if elements outside the viewport are garbage collected because you are browsing a virtual list. Instagram is an example but they don't have text in the elements so it's not a huge hindrance.