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Firefox may import data directly from Opera GX: open Settings > Import Data and check the available browsers. If Opera GX is not listed, move bookmarks using an HTML file; passwords require a separate CSV route that depends on the Firefox version and platform. Neither route is documented as transferring an entire Opera GX profile.
Try Firefox’s direct import first
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In Firefox, open Settings > Import Data. The wording or location may differ by Firefox version. Mozilla also documents this route: open the Bookmarks Library, then choose Import and Backup > Import Data from Another Browser.
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Look for Opera GX in the source-browser list. Mozilla does not specifically guarantee that Opera GX will appear; the available browsers and transferable data depend on what Firefox detects and supports.
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If Opera GX appears, select the matching profile and review the data categories Firefox offers for it. Import only the categories you want, then complete the wizard.
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Afterward, verify important bookmarks and logins in Firefox. If Opera GX is absent, use the relevant file-based steps below.
If Opera GX isn’t listed, move bookmarks with an HTML file
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In Opera GX, open the bookmarks manager and export bookmarks as an HTML file. Opera documents bookmark export in its Features help.
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In Firefox, open the Bookmarks Library and choose Import and Backup > Import Bookmarks from HTML. Select the exported file. Mozilla documents HTML import as the fallback for bookmarks from a browser that is not listed in the import wizard: Import data from another browser.
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Check several folders and bookmarks in Firefox to confirm the import worked as expected.
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Use HTML when transferring bookmarks between browsers. Firefox’s JSON or JSONLZ4 bookmark backup is intended for restoring Firefox bookmarks, not for importing Opera GX bookmarks; see Mozilla’s bookmark export and transfer guidance.
Move saved passwords separately
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Opera documents exporting saved passwords to a CSV file in its Web preferences help. Treat the CSV as sensitive: it contains readable credentials, so store it only where necessary and remove it securely once you have finished importing.
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In Firefox, check the password-import options available in your installed version. Mozilla describes password import as an option for supported browser sources and provides guidance for importing from a password file through its browser import instructions.
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If Opera GX was not detected, use Firefox’s CSV password-import option if your version offers it. CSV compatibility is not guaranteed across every Firefox version and platform. Confirm that several important accounts appear and that their credentials work before relying on the imported entries.
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What may not transfer
The documented HTML fallback is for bookmarks, and password migration follows a separate path. Mozilla’s instructions do not establish that this workflow transfers Opera GX history, extensions, cookies, settings, open tabs, or every other profile item. Plan to configure or move unsupported items separately rather than assuming Firefox can take over the entire profile.
If you are moving between devices, export the HTML and, if needed, CSV files on the Opera GX device, transfer them to the other device, and import them there. Keep the files private, especially the password CSV, and delete them when the transfer and verification are complete.
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