Please do let us know if that solves the problem for you. If it doesn't we'll have to figure out how your case is different than the ones we fixed.
Bug 1726955 Comment 4 Edit History
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Please do let us know if that solves the problem for you. If it doesn't we'll have to figure out how your case is different than the ones we fixed. I should note that by default our pre-release builds create their own clean profile. When you load the first time it won't have your history or bookmarks and so on, but don't worry! Your data will all be right where you left it when you switch back to regular Firefox. This is to protect your data in case the pre-release versions have bugs. [There are ways to migrate your data, but we recommend against it unless you decide to permanently switch to using Beta.]