How do I view the sync log for Firefox?

The page about:sync-log shows:

Index of file:///home/thufir/.mozilla/firefox/ 

How do I get more detail? That directory is empty. Can I receive these logs by e-mail perhaps?

1 Answer

How do I get more detail? That directory is empty.

Normally the sync log only shows errors.

See below for instructions on enabling sync log on success.

about:sync-log provides a list with log files and shows the location where they are stored in the Firefox profile on the hard disc.

By default it shows only errors though. Depending on how long you have worked without syncing it can take up to a couple of minutes to be completed.

Luckily you can configure Firefox that it writes log files on success as well. Then all one has to do is hit reload on about:sync-log and wait till the success log file appears or gets appended.

There are a lot of setting that effect the sync process. A lot of timeouts and those kind of things,… I guess it's better not to tamper with most of them. :-)

However, here's the trick that lets Firefox create/write log files on sync success as well.

Type about:config and be super careful when changing anything.

The parameter in question here is services.sync.log.appender.file.logOn. Just type that into the filter and two keys will be shown.

services.sync.log.appender.file.logOnError default true services.sync.log.appender.file.logOnSuccess default false 

Change the latter one to true and keep an eye on the list shown when typing about:sync-log in the location bar.

Delete some of the files (in case this doesn't happen automatically — I did not check) once you'll have got too many of those.

Source How do I know that sync has completed successfully and that it is safe to close the browser?