Where Does Mercury Browser Store Profiles?
Where the Mercury browser keeps Firefox style profiles on desktop.
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Mercury is a Firefox fork, so profiles follow Firefox conventions: a Profiles folder plus profiles.ini mapping names to paths. Portable zips instead build a USER_DATA folder next to their launch script when you use the bundled batch file.
Two profile directories on one machine is normal for Firefox family browsers, not a bug. Use about:support to confirm the live one before copying anything between forks.
Where Mercury stores this, by platform
%APPDATA%\Mercury\
Firefox style layout with Profiles children and profiles.ini registry. Confirm the live profile at about:profiles. Portable zips use a USER_DATA folder beside the launcher instead when run via the script.
~/.mercury/
Same profiles.ini plus Profiles structure under the home directory. Run the bundled shell script for portable mode with USER_DATA beside it. Close all Firefox forks before swapping profile contents.
Frequently asked questions
How do I find my Mercury profile folder?
Type about:profiles in the address bar. It lists every profile with its root path and offers one click launch, which beats digging through AppData by hand.
Can I reuse a Firefox profile in Mercury?
Let Mercury create a profile once, close everything, then replace the new profile contents with the old files and relaunch with --allow-downgrade if versions differ. Keep major versions within a couple releases to dodge corruption.
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