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Sync Failing Due to Unknown Error ("database disk image is malformed")

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I'm running an updated version of Firefox 40.0 (beta channel) on Mac OS 10.10.4 and am experiencing an error with Sync.

Sync is constantly failing with the following message "Sync encountered an error while synching: Unknown error. Sync will automatically retry this action." It has not successfully synced in perhaps a week and so that message is all but permanently affixed to the bottom of every browser window.

I've pulled the latest log from about:sync-log which I've uploaded to PasteBin (http://pastebin.com/HVeRr33a). The relevant bit seems to be the following three lines:

1438960925355 Sync.Status DEBUG Status for engine history: error.engine.reason.unknown_fail 1438960925355 Sync.Status DEBUG Status.service: success.status_ok => error.sync.failed_partial 1438960925355 Sync.ErrorHandler DEBUG history failed: database disk image is malformed No traceback available

What can I do the fix the database disk image? Additionally, what causes the image to become malformed and how can I prevent that?

I'm running an updated version of Firefox 40.0 (beta channel) on Mac OS 10.10.4 and am experiencing an error with Sync. Sync is constantly failing with the following message "Sync encountered an error while synching: Unknown error. Sync will automatically retry this action." It has not successfully synced in perhaps a week and so that message is all but permanently affixed to the bottom of every browser window. I've pulled the latest log from about:sync-log which I've uploaded to PasteBin (http://pastebin.com/HVeRr33a). The relevant bit seems to be the following three lines: 1438960925355 Sync.Status DEBUG Status for engine history: error.engine.reason.unknown_fail 1438960925355 Sync.Status DEBUG Status.service: success.status_ok => error.sync.failed_partial 1438960925355 Sync.ErrorHandler DEBUG history failed: database disk image is malformed No traceback available What can I do the fix the database disk image? Additionally, what causes the image to become malformed and how can I prevent that?

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For anyone who found the formatting difficult to read in the last post the most relevant bit from the log is as follows:

history failed: database disk image is malformed No traceback available

Any help would be appreciated.

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