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My Inbox shrinks to half page on left side every time I launch. Can't see message title, only who from and date.

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The inbox shrinks to half size and lines up to left side of Firefox window every time I launch. I can't see the message title. If I go into settings, everything is cut off even more.

The inbox shrinks to half size and lines up to left side of Firefox window every time I launch. I can't see the message title. If I go into settings, everything is cut off even more.

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I am assuming that you use a Bookmark to open that page, and it is opening in the Sidebar rather than the browser window.

Opening in the Sidebar is the default action for bookmarks that are created via a "Bookmark this Page" link or button on a website. Make sure you use the many "Bookmark this Page" methods that are in Firefox instead.

Right-click that bookmark and select Properties, then un-check the preference for Load this bookmark in the sidebar, and then click Save.

If that isn't your problem, please post a screenshot of that issue.
https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem

It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB.

Then use the Browse .... button below the Post a Reply text box to upload the screenshot.