Having 50+ tabs open at the same time is bound to cause problems. I have never heard of someone doing this. Is there a reson you need all these tabs open at the same time? You could just bookmark the pages and not need to keep 50 tabs open. Also, what version of Windows you are running matters. Honestly, If you open 50 tabs I would expect a crash. It simply takes up too much memory to run 50 tabs. Genaric response below.

We're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash IDs to help us learn more about your crash.

1. Enter about:crashes in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
2. Copy the 5 most recent Report IDs that start with bp- and then go back to your forum question and paste those IDs into the "Post a Reply" box.

Note: If a recent Report ID does not start with bp- click on it to submit the report.

(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)

Thank you for your help!

More information and further troubleshooting steps can be found in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

I've got Windows 7. This problem appears only on this laptop. On the other laptop I open 100+ tabs and Firefox works normal and never crashes. And on this laptop the problem started for about a half year ago (he's 3 years old). I have to open so many tabs because of my work.

If you have a job that requires 100 tabs to be open that is a very unique job. Due to the increase in graphics/resolution of computers now I dare say it is impossible to open 100 tabs unless you have a $10,000 crazy set-up or buy devices to increase your ram, memory,cpu and a really expensive GPU or turn your resolution and graphics to there lowest levels, turn off color, and shut down all programs that you can. I really do not think it is possible. I never go past 5 tabs.

Signature OOM OutOfMemory +++++++++++++++++++++++++++ Total Virtual Memory 2147352576

Available Virtual Memory 295575552

System Memory Use Percentage 87

Available Page File 571686912

Available Physical Memory 413462528

OOM Allocation Size 80

Firefox uses too much memory (RAM) - How to fix This article describes how to make Firefox use less memory to make it run faster and prevent crashes.

https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding