I'm using Chrome v. 74.0.3729.157 for my browser also I have an ad blocker which is turned off for Roll20, and these pages have worked in the past. I search for "spells" and in the resulting list I select "Spells" under Rules. It opens and this entry list links to spell list of classes by level. Each link opens up a sad face page icon that says roll20.net refused to connect. Also opening "Spells list" is very slow at loading, and a lot of times doesn't load at all. I did notice some ads for Roll20 was able to load on the pages sometimes when everything fails. These are quite redundant being that I'm on Roll20 playing a game on Roll20 and there are advertisements in the items I've purchased from Roll20 for Roll20. Also it's a bit of a slap in the face to see advertisements on content that's been purchased. It would be understandable for a free user to see these ads, but if this is also preventing a paid user from seeing purchased content in some indirect way, it's a bit appalling as well. Also there are some issues with items in the SRD that link to "Combat". There are possibly more but for a quick example. Searching for "actions" will produce results "Combat: Actions in Combat" and "Combat: Bonus Actions" when either of these are selected they open the PHB "Combat" which only has a two paragraph blurb unrelated to Actions in Combat or Bonus Actions.