hello, could you provide your latest few submitted crash reports? please enter about:crashes into the location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply. this will give us a better understanding what may be triggering those crashes.

bp-0a789d54-1c47-4841-a4c5-6d87e2160105 bp-f25b88f4-13c5-4a26-bf27-dd81c2151204 bp-909948ce-7272-4c91-9df3-af9f62151121

These are the latest crash reports available. But today the 'going-unresponsive-and-force-close' thing happened thrice in the last 1 hour. That does qualify as a crash??

thanks, it's certainly a good idea to keep the skype click-to-call extension disabled because it causes some known performance issues.

in addition please try to disable hardware acceleration in the firefox menu ≡ > options > advanced > general (that setting will take a restart of the browser to take effect).

i'd also recommend running a scan with those two security tools on your system:

• the free version of malwarebytes
• adwcleaner