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I also tested subtitle display in Chrome, but found that the text was too large and difficult to read. Also, since subtitles have no background, they overlap with the video and are difficult to read.
This may be resolved by adjusting the font size and display position in the WebVTT file, but it will complicate the creation of the WebVTT file.
On the other hand, in Firefox, the font size is appropriate and the background color is automatically set to an appropriate darkness, making subtitles easier to read.
memo; mozilla/web-ext#2532