My JS is terrible, and I find it’s really hard to make even simple tweaks to complex JS built pages. I really miss platypus (a wysiwig editor that generated us

My JS is terrible, and I find it’s really hard to make even simple tweaks to complex JS built pages. I really miss platypus (a wysiwig editor that generated user scripts from edits). I’ve searched and searched but there seems to me no functional equivalent today. I’d love an easy way to run a regex on some particular part of a page.