I'd like to play Netflix videos on my portable tablet, which doesn't support the Netflix app. Can I use a third-party tool, like StreamUlt Software to convert them to MP4 format and transfer them to my device for offline listening while trip?
Handbrake!
That should be able to convert .. maybe, but haven't tried..
Should I ask how the content is being downloaded? 
I use Netflix and as far as I can tell one can only download ON the app ,and play back ON the app. There's no file it saves somewhere that can be converted.
What does it says if you try to open Netflix in a browser on your tablet ?
I want to play Netflix movies offline. Through the browser is an online way!
Isn't it possible to download movies via Netflix browser? I know you can do this with the Netflix app, but unsure with the browser.
Brave A.I. search engine suggests:
" Convert Netflix to MP4 in Linux
To convert downloaded Netflix content to MP4 on Linux, you can use third-party software designed for this purpose. One recommended tool is StreamFab Netflix Downloader, which supports Linux systems and allows you to download Netflix videos in MP4 and MKV formats directly without re-encoding, ensuring lossless quality. Another option is Audials Movie, although it is not available for macOS or Linux, it offers high-speed recording and AI enhancement capabilities. For Linux users, you might also consider using MiniTool Video Converter, which provides a straightforward method to record Netflix content in MP4 format. Ensure you adjust your browser settings to avoid hardware acceleration, which can cause issues during recording.
AI-generated answer. Please verify critical facts."
No, an official download is not available for the Netflix browser. To do this, I have to use StreamUlt.