• Description of problem:
  When starting thunderbird from a terminal, the following error message is shown (it does not prevent thunderbird from starting up, however):

> /usr/bin/thunderbird: line 143: fg: no job control

• Version-Release number of selected component (if applicable):
  thunderbird-102.4.0-1.el7_9

• How reproducible:
  100%

• Steps to Reproduce:
  1. Launch thunderbird with stderr captured.

• Actual results:
  Thunderbird starts up, but it logs

> /usr/bin/thunderbird: line 143: fg: no job control

• Expected results:
  No such error message.

• Additional info:
  Lines 142-143 of the "/usr/bin/thunderbird" shell script is

> # Linux version specific environment variables
> %RHEL_ENV_VARS%

This is taken as a shell "jobspec", hence the error message.

Presumably, the RHEL7 RPM install script fails to substitute %RHEL_ENV_VARS%.