In order to help to view texts in Meitei script properly, you need to have your device set up to see web pages encoded in Unicode Meitei script (extended). To do this, you need to have a Unicode capable browser and Unicode Meetei Mayek fonts Meetei Mayek (Unicode block). Firefox's latest versions support viewing Meitei script once you install the fonts.
In Debian GNU/Linux, the package fonts-noto-core supports many scripts, including for Meitei. Other Linux distros probably have the same or similar packets.

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