Thanks for the suggestion. After looking through the HTML on some different videos on the streaming services, here's what I found.

For Amazon, the <title> tag in the <head> does contain the work title (e.g. "Watch (title) | Prime Video" or "Amazon.com: Watch (title) | Prime Video"). However, if it's a TV show, the individual episode name is not included with that attribute, but Play It My Way may have some functions to help with that. There's also a <meta name="title"> tag with a content value identical to the value for the title tag.

For Netflix, the <title> tag simply has the value "Netflix", and I couldn't find any <meta property="og:title"...> or <meta name="title"> tags. I did find a property in the Netflix API that would allow us to get the unique ID for a work, though that ID is also included in the URL, so that may not be very significant.

Likewise for Disney Plus, the <title> tag simply has the value "Disney+ | Video Player". It does have a <meta property="og:title"...> tag, but it's value is identical to the value of the <title> tag.

So fetching the title may work for Amazon, but mapping the URLs to the internal entries may be the best way for Netflix and Disney Plus.

As far as monitoring the playback position, I actually did find an alternative solution. There's another open-source filtering project called "VideoSkip", which has both a standalone filter player (for legal copies of movies/TV show episodes stored on one's computer) and a Chrome extension for streaming. The extension was created with the intention to work on virtually any streaming service (it's been tested on a handful of sites so far), and is also meant to be available in any language, provided there are enough community translators. I think its extension repository will come in real handy as the Movie Content Filter extension is developed.

The extension monitors the playback position using the following code:
if(myVideo) myVideo.ontimeupdate = function() {...}

The variable myVideo is the video element that we would get via querySelector. Within the anonymous function above, a for loop runs through all the work's filter tags to check if the current time is within the start time and end time of a tag. Then it checks the tag's action and sets it accordingly.

For reference, the function can be found here on line 189.

Chrome extension #6

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