Restore sessionstore.js

Hi, my firefox crashed after a half of the year usage. My sessionstore.bak size is ~100Mb. After crash everything was lost - there was no option to restore tabs after restart of ff. The file sessionstore.bak contains data from previous crashes which I didnt restore. So there is proper data in the hierarchy from previous crashes and sure - from the last one. I created new profile and put the sessionstore.bak as sessionstore.js into profile directory, started ff but nothing happened. My question is - how can I restore whole ~100Mb history in the ff. If its impossible ;/ how could I easy parse this json to get only ulrs of open tabs and tabs from previous crashes. I dont need history of each tab, dont need urls of closed tabs... I cant find any useful parser. The best should be to ff parse it and let me restore it as it did before. Thanks for any advice! Best, John