Firefox browser phone mode can not be full-screen?

in Firefox mobile phone mode, set scale:

according to dpr
<meta name="viewport" content="width=device-width, initial-scale=0.5, maximum-scale=0.5, minimum-scale=0.5, user-scalable=no, minimal-ui">

this is how it appears in Firefox

:

? Is this a browser compatibility issue or?

Apr.21,2022

is this all right?

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be4a92-3170f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be4a92-3170f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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