Adblock interferes with recordings

[louislva]

Repro:

• Install UBlock Origin; this seems the culprit
• Use the chrome-extension paired with the mock-backend and recording a session on https://www.azlyrics.com/lyrics/villagepeople/ymca.html.
• Use the mock-backend route to replay the session, and notice that the dark purple bar is much larger in the replay (as large as it would have been if the ad was still there) than it was when using the website. This also causes the cursor not to be aligned.