запуск нескольких браузеров

Firejail. Ещё у firefox есть дополнение контейнеры, поищи аналог у оперы.

В терминале выполни: opera –help. И смотри, если есть ключ выбора конфига, то повезло.

opera -help
Opera 68.0.3618.173 Stable
Features available through command-line switches:
--with-feature:aliexpress-modal [Enabled by default: false]
--with-feature:enhanced-address-bar [Enabled by default: false]
--with-feature:booking-modal [Enabled by default: false]
--with-feature:bookmarks-panel [Enabled by default: true]
--with-feature:new-component-update-mechanism [Enabled by default: false]
--with-feature:opera-doh [Enabled by default: true]
--with-feature:history-onboarding [Enabled by default: true]
--with-feature:history-panel [Enabled by default: true]
--with-feature:horizontal-tab-cycler [Enabled by default: true]
--with-feature:instagram-panel [Enabled by default: true]
--with-feature:lookalike-url-navigation-suggestions [Enabled by default: true]
--with-feature:notification-overlay-on-taskbar [Enabled by default: false]
--with-feature:search-in-open-tabs [Enabled by default: true]
--with-feature:shared-start-page [Enabled by default: true]
--with-feature:sidebar-extensions-in-browser-sidebar [Enabled by default: true]
--with-feature:sidebar-setup-panel [Enabled by default: true]
--with-feature:suggestion-scoring-improved [Enabled by default: true]
--with-feature:sync-passphrase-papercuts [Enabled by default: false]
--with-feature:tab-strip-views [Enabled by default: false]
--with-feature:video-pop-out-surface-layers [Enabled by default: true]
--with-feature:weather-on-startpage [Enabled by default: false]
--with-feature:workspaces [Enabled by default: true]
--with-feature:yandex-zen-news [Enabled by default: false]

в хроме --user-data-dir=

Тогда зачем нужен такой браузер. Напрмер, у vivaldi есть переменная USER_DATA_DIR, в которой задается нахождение конфига.

Несколько профилей в Опера