From MozillaZine Knowledge Base

Note: The localstore.rdf file has been deprecated and replaced with xulstore.json in mozilla34 (bug 559505). [1] [2]

localstore.rdf stores customized data on the interface, such as toolbar customizations, window positions and sizes, and tree sort orders. In Firefox 1.5 and above, the safe mode option "Reset toolbars and controls" clears this file.

Editing

It's not advisable to edit this file manually because of its complexity.

Moving

This file can be moved to a different profile without any extra effort.

Deleting

Deleting localstore.rdf will reset your customized toolbars, window positions and sizes, tree sort orders, and similar settings. A new file will be created on start up or when the application first needs to write to the file.

Before deleting this file, saving a screen capture (print screen) could prove useful in implementing customizations to restore former appearance after this file is recreated.

Related bug reports

• Bug 99236 – localstore.rdf should be deleted when it is corrupt
• Bug 303279 - Safe Mode: Use "safe" localstore
• Bug 307558 - Customized toolbars are reset to default because of corrupt localstore.rdf after search plugin update check
• Bug 319196 - customized toolbar always reset to default on restart, bookmarks and search engines lost, unable to add search engines (localstore.rdf corruption on upgrade or crash)
• Bug 559505 - localstore.rdf kills ponies / Deprecate localstore.rdf and replace it with xulstore.

See also

• Corrupt localstore.rdf
• Browser will not start up
• XUL Tutorial:Persistent Data