and now it starts working... wtf... why firefox have so many bugs? i like it. but this is stupid

If the problem returns, let us know. Then we can work on it.

Note that the usual steps to try in cases like that is to close (quit) and restart Firefox or reboot the computer.

cor-el said

Note that the usual steps to try in cases like that is to close (quit) and restart Firefox or reboot the computer.

is this a rare problem? or can it appear frequently? Did you have this?

FredMcD said

If the problem returns, let us know. Then we can work on it.

restart pc \ reinstall firefox?

Reboot the computer. Does the problem come back?

FredMcD said

Reboot the computer. Does the problem come back?

yes, it sometimes appears again. but then it goes on after a minute(without reboot). what could be the problem?

Let's make sure your system is clean.

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

You can check for sandbox security issues.

• https://wiki.mozilla.org/Security/Sandbox

You can set this pref to 2 or 1 on the about:config page to lower the sandbox security setting.

• security.sandbox.content.level = 1
• close and restart Firefox to make the change effective.

If '1' still doesn't have effect then try '0' to disable the sandbox.

If this didn't work then undo/reverse the change and reset the pref via the right-click context menu to the default value.

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

FredMcD said

Let's make sure your system is clean. You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

no i have not. i have clear system and clear firefox. in fact it happened once. I do not see this anymore. but I would like to know why this happened. However, if you have not encountered such a problem...

cor-el said

You can check for sandbox security issues.

• https://wiki.mozilla.org/Security/Sandbox

You can set this pref to 2 or 1 on the about:config page to lower the sandbox security setting.

• security.sandbox.content.level = 1
• close and restart Firefox to make the change effective.

If '1' still doesn't have effect then try '0' to disable the sandbox. If this didn't work then undo/reverse the change and reset the pref via the right-click context menu to the default value. You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

wut is this? sandbox?

could it be a one-time bug?

The clipboard is part of the operating system, and it's possible that Firefox lost access to it temporarily for some odd reason. If it doesn't happen regularly, it's difficult to figure out what could be causing it.