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UPDATE The seems to be working for the usage in bash:

watch -n 1 "ps aux | grep [f]irefox"

watch -n 0.1 "ps aux | grep [f]irefox"

watch -n 1 "ps aux | grep [f]irefox && free -m"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox && free -m"

watch -d -n 0.1 "ps aux | grep [f]irefox"

Press F5 in Tab and watch

When i kill the a tab with the right pid i get the message in the tab, that the tab is crashed now ^^

In Firefox, about:performance is right.

But check also this in bash if i close or open and load a page tab:

$ pidof firefox

$ pidof firefox-esr

$ pgrep firefox get the main/parentid of one or "n" profiles

$ pgrep firefox-esr get the main/parentid of one or "n" profiles

Get parentid and childid

$ ps aux | grep [f]irefox

$ ps aux | grep [f]irefox | grep tab

You see the parentBuildID and something of the child/tab

It looks like that you can't kill the child/tab only the parentBuildID, if you kill the child/tab the tab will crash but not close(but killed).

ps -ef | grep [f]irefox | wc -l

UPDATE The seems to be working for the usage in bash:

watch -n 1 "ps aux | grep [f]irefox"

watch -n 0.1 "ps aux | grep [f]irefox"

watch -n 1 "ps aux | grep [f]irefox && free -m"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox && free -m"

watch -d -n 0.1 "ps aux | grep [f]irefox"

Load a page and press F5 in the tab(again and again or hold the F5 button pressed) and watch

When i kill the a tab with the right pid i get the message in the tab, that the tab is crashed now ^^

In Firefox, about:performance is right.

But check also this in bash if i close or open and load a page tab:

$ pidof firefox

$ pidof firefox-esr

$ pgrep firefox get the main/parentid of one or "n" profiles

$ pgrep firefox-esr get the main/parentid of one or "n" profiles

Get parentid and childid

$ ps aux | grep [f]irefox

$ ps aux | grep [f]irefox | grep tab

You see the parentBuildID and something of the child/tab

It looks like that you can't close the child/tab only the parentBuildID, if you kill the child/tab the tab will crash but not close(but killed).

ps -ef | grep [f]irefox | wc -l

ps -ef | grep [f]irefox | grep tab | wc -l

UPDATE The seems to be working for the usage in bash:

watch -n 1 "ps aux | grep [f]irefox"

watch -n 0.1 "ps aux | grep [f]irefox"

watch -n 1 "ps aux | grep [f]irefox && free -m"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox && free -m"

watch -d -n 0.1 "ps aux | grep [f]irefox"

Press F5 in Tab and watch

When i kill the a tab with the right pid i get the message in the tab, that the tab is crashed now ^^

In Firefox, about:performance is right.

But check also this in bash if i close or open and load a page tab:

$ pidof firefox

$ pidof firefox-esr

$ pgrep firefox get the main/parentid of one or "n" profiles

$ pgrep firefox-esr get the main/parentid of one or "n" profiles

Get parentid and childid

$ ps aux | grep [f]irefox

$ ps aux | grep [f]irefox | grep tab

You see the parentBuildID and something of the child/tab

It looks like that you can't kill the child/tab only the parentBuildID, if you kill the child/tab the tab will crash but not close.

ps -ef | grep [f]irefox | wc -l

UPDATE The seems to be working for the usage in bash:

watch -n 1 "ps aux | grep [f]irefox"

watch -n 0.1 "ps aux | grep [f]irefox"

watch -n 1 "ps aux | grep [f]irefox && free -m"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox && free -m"

watch -d -n 0.1 "ps aux | grep [f]irefox"

Press F5 in Tab and watch

When i kill the a tab with the right pid i get the message in the tab, that the tab is crashed now ^^

In Firefox, about:performance is right.

But check also this in bash if i close or open and load a page tab:

$ pidof firefox

$ pidof firefox-esr

$ pgrep firefox get the main/parentid of one or "n" profiles

$ pgrep firefox-esr get the main/parentid of one or "n" profiles

Get parentid and childid

$ ps aux | grep [f]irefox

$ ps aux | grep [f]irefox | grep tab

You see the parentBuildID and something of the child/tab

It looks like that you can't kill the child/tab only the parentBuildID, if you kill the child/tab the tab will crash but not close(but killed).

ps -ef | grep [f]irefox | wc -l

UPDATE The seems to be working for the usage in bash:

watch -n 1 "ps aux | grep [f]irefox"

watch -n 0.1 "ps aux | grep [f]irefox"

watch -n 1 "ps aux | grep [f]irefox && free -m"

watch -n .0.1 "ps aux | grep /usr/lib/firefox-esr/firefox"

watch -n .0.1 "ps aux | grep /usr/lib/firefox-esr/firefox && free -m"

watch -d -n 0.1 "ps aux | grep [f]irefox"

Press F5 in Tab and watch

When i kill the a tab with the right pid i get the message in the tab, that the tab is crashed now ^^

In Firefox, about:performance is right.

But check also this in bash if i close or open and load a page tab:

$ pidof firefox

$ pidof firefox-esr

$ pgrep firefox get the main/parentid of one or "n" profiles

$ pgrep firefox-esr get the main/parentid of one or "n" profiles

Get parentid and childid

$ ps aux | grep [f]irefox

$ ps aux | grep [f]irefox | grep tab

You see the parentBuildID and something of the child/tab

It looks like that you can't kill the child/tab only the parentBuildID, if you kill the child/tab the tab will crash but not close.

ps -ef | grep [f]irefox | wc -l

UPDATE The seems to be working for the usage in bash:

watch -n 1 "ps aux | grep [f]irefox"

watch -n 0.1 "ps aux | grep [f]irefox"

watch -n 1 "ps aux | grep [f]irefox && free -m"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox"

watch -n 0.1 "ps aux | grep /usr/lib/firefox-esr/firefox && free -m"

watch -d -n 0.1 "ps aux | grep [f]irefox"

Press F5 in Tab and watch

When i kill the a tab with the right pid i get the message in the tab, that the tab is crashed now ^^

In Firefox, about:performance is right.

But check also this in bash if i close or open and load a page tab:

$ pidof firefox

$ pidof firefox-esr

$ pgrep firefox get the main/parentid of one or "n" profiles

$ pgrep firefox-esr get the main/parentid of one or "n" profiles

Get parentid and childid

$ ps aux | grep [f]irefox

$ ps aux | grep [f]irefox | grep tab

You see the parentBuildID and something of the child/tab

It looks like that you can't kill the child/tab only the parentBuildID, if you kill the child/tab the tab will crash but not close.

ps -ef | grep [f]irefox | wc -l