[Windows 10] install Firefox at win10

last night, My friend installed Firefox in Win10, when install nearly finish, it will start to import 'cookie,bookmark...' from IE to Firefox..

But my friend told me, this process need over 2 hour, still didn't finish.

anyone have idea? or Firefox is not compatible with Win10 IE old data?

His Windows 10 is come from a HP new notebook which brought in last 2 month.

So, the notebook is came with Win10 already, and last week updated to ver 1607 .


Bug 1268855 - Migrating bookmarks from IE is much slower in 45
Bug 1283557 - Migration from IE doesn't work (broken) on win64 builds of Firefox (win10?)