Lightning 2.5b1 Linux builds fautly, please use 2.5b2

Just a quick note: Due to a slight packaging glitch, the Linux Lightning builds for 2.5b1 were broken. I have just uploaded 2.5b2 to, you can get it in the “Development Channel” box or from the Other Versions page.



  1. Hello: is there any word on when a Thunderbird 2.4a2 will be available for Windows?

  2. Is there any plans/timetable for OAuth 2.0 support in Lightning?

    Google’s old CalDAV endpoint is being shut down in 2 months, and the GDATA one doesn’t work nearly as well as CalDAV for Google Calendars.

    • Philipp Kewisch

      OAuth 2.0 is supported in the latest beta builds. Give it a try and please file a bug if something doesn’t work.

  3. Running TB 23.0 & Lightning 2.5b2 on Windows 7 x64 with dual monitor setup.

    Enabling Lightning wrecks the panel layout and renders TB effectively unusable. Panels cannot be resized and the application window cannot be resized. This problem exists with 17 & 1.91 as well. I upgraded to latest versions to see if it would resolve the problem.

    It appears that the calendar panel demands an unreasonable horizontal real estate and squishes everything else.

    Please help!

  4. I have two feature request that should be easy to implement, where can I post them? I had troubles finding one place for feature request for this marvelous soft!!
    Keep it up!

    • Philipp Kewisch

      Our bugtracker is at Please be sure to search first in the Product “Calendar”.

      • I have an easy but nice feature request. I went to the URL you point out but it is by default for Firefox.. you can choose Thunderbird, but Lightning is not listed separately..
        So just to make it clear:
        1) should I place my request under Thunderbird?
        2) should I file it as a *bug report* even if it is a *request*?

        Thanks, Lightning rules!!!

        • Philipp Kewisch

          Next to Firefox and Thunderbird, there is also a product “Calendar”, please file your request there. You can file even requests there, be sure to change the severity to “enhancement” so its easier to categorize.

  5. What is the difference between “refresh calendar” (1) and “Synchronize calendars” (2)??
    I mean, would “refresh calendar” be equivalent to say “synchronize calendar” but for that individual calendar only (as opposed to “”Synchronize calendars” which works for all calendar as I assume from the plural “calendars”)?

    (1) right-click on a calendar, and there you see the property to “refresh” eg every 30 minutes
    (2) right-click on a calendar

    Thanks!! I LOVE lightning!!! Keep it up!!!

    • Philipp Kewisch

      Sorry, this is just inconsistent wording. Refresh/Synchronize means the same thing. The right-click + synchronize menuitem will refresh all calendars manually, the “refresh” in the calendar properties will automatically refresh the specific calendar after the given time.

  6. There seem to be a huge Memory Leak with Lightning 1.9.1 and TB 17.0.7 on OS X 10.8.4. I tried it yesterday against my Exchange 2010 Calendar and all of a sudden TB became sluggish. Checked the Activity Monitor, found that TB is using over 750MB Memory!. Removed Lightning and the memory went down back to around 150MB. At this time, unfortunately, Lightning is un0usable for me unless someone can fix this issue. Thanks

    • Philipp Kewisch

      Yes, Lightning uses a bit of memory. I’m not sure how much to consider “normal”, but as most of our code is Javascript, its harder to figure out where potential memory leaks are.

      I’m sorry I can’t offer you a better solution, but there is not much I can do for you right now. As we discover leaks, we will of course fix them.

  7. Just installed 2.5b2 on Ubuntu 13.04. Running Thunderbird 23.0~b1 from the Mozilla Team Thuderbird-Next PPA.

    Thunderbird now crashes each time on start with “Segmentation fault (core dumped).” Disabling the Lightning extension removes the problem.

    I tried getting a debug log with the calendar.debug.log and calendar.debug.log.verbose settings, but no file is written. I have NSPR_LOG_FILE=/tmp/thunderbird.log

    • Philipp Kewisch

      The calendar.debug.log(.verbose) only write to the error console and won’t help you much for startup. Do you get a crash reporter dialog for this? If so, could you reply with the crash reporter id?

  8. This option is provided by the “Provider for Google Calendar” extension. Please make sure it is installed and enabled.