Thunderbird 2-teilige Signatur?

// ...
let account = await browser.accounts.getDefault();
let signature = account.identities.signature;
// ...

function Get-ThunderbirdSignature {
    param(
        [parameter(mandatory=$true,ParameterSetName="A")][switch]$Default,  
        [parameter(mandatory=$true,ParameterSetName="B")][ValidateNotNullOrEmpty()][string]$email  
        
    )
    if (!(Test-Path "$env:APPDATA\Thunderbird\profiles.ini")){  
        throw "No thunderbird profiles found!"  
    }
    $tbprofile = "$env:APPDATA\Thunderbird\$([regex]::match((gc "$env:APPDATA\Thunderbird\profiles.ini" -raw),'(?im)^Default=(Profiles/[^\s]+)').Groups[1].Value)" -replace '/','\'  
    $prefs = gc "$tbprofile\prefs.js" -raw  

    switch($PSCmdlet.ParameterSetName){
        "A" {  
            $default_account = [regex]::match($prefs,'(?im)"mail.accountmanager.defaultaccount", "([^"]+)').Groups[1].Value  
            if (!$default_account){
                throw "No default account found in profile!"  
            }
            $account_id = [regex]::match($prefs,"(?im)`"mail.account.$default_account.identities`", `"([^`"]+)").Groups[1].Value  
            $account_signature = [regex]::match($prefs,"(?im)`"mail.identity.$account_id.htmlSigText`", `"([^`"]+)").Groups[1].Value  
            return $account_signature
        }

        "B" {  
            $matches = [regex]::matches($prefs,'(?i)"mail.identity.([^\.]+).useremail", "([^"]+)').Captures | ?{$_.Groups[2].Value -eq $email}   
            if ($matches.count -gt 0){
                $signature = [regex]::match($prefs,"(?im)`"mail.identity.$($matches.Groups[1].Value).htmlSigText`", `"([^`"]+)").Groups[1].Value  
                return $signature
            }else{
                throw "Identity not found"  
            }
        }
    }
}

# get signature from specific account
Get-ThunderbirdSignature -email 'user@domain.tld'  

# get signature of default account
Get-ThunderbirdSignature -Default

function Set-ThunderbirdSignature {
    param(
        [parameter(mandatory=$true,ParameterSetName="DefaultAccount")][switch]$default,  
        [parameter(mandatory=$true,ParameterSetName="DefinedAccount")][ValidateNotNullOrEmpty()][string]$email,  
        [parameter(mandatory=$false)][string]$signature,
        [parameter(mandatory=$false)][switch]$ashtml
        
    )
    if (!(Test-Path "$env:APPDATA\Thunderbird\profiles.ini")){  
        throw "No thunderbird profiles found!"  
    }
    # determine default tb profile directory
    $tbprofile = "$env:APPDATA\Thunderbird\$([regex]::match((gc "$env:APPDATA\Thunderbird\profiles.ini" -raw),'(?im)^Default=(Profiles/[^\s]+)').Groups[1].Value)" -replace '/','\'  
    # read prefs
    $prefs = gc "$tbprofile\prefs.js" -raw  
    # replace newlines with \n
    $sig = $signature -replace [environment]::NewLine,'\n'  
    $account_id = $null
    switch($PSCmdlet.ParameterSetName){
        "DefaultAccount" {  
            $default_account = [regex]::match($prefs,'(?i)"mail.accountmanager.defaultaccount",\s*"([^"]+)').Groups[1].Value  
            if (!$default_account){
                throw "No default account found in profile!"  
            }
            $account_id = [regex]::match($prefs,"(?i)`"mail.account.$default_account.identities`",\s*`"([^`"]+)").Groups[1].Value  
        }

        "DefinedAccount" {  
            $account_id = [regex]::matches($prefs,'(?i)"mail.identity.([^\.]+).useremail",\s*"([^"]+)').Captures | ?{$_.Groups[2].Value -eq $email} | select -F 1 | %{$_.Groups[1].Value}  
        }
    }
    if ($account_id -ne $null){
        # set signature format
        if ($prefs -match "`"mail.identity.$account_id.htmlSigFormat`""){  
            $prefs = $prefs -replace "(?<=`"mail.identity.$account_id.htmlSigFormat`",)\s*([^\)]+)",($ashtml.IsPresent.ToString().ToLower())  
        }else{
            $prefs = $prefs -replace '\Z',("`r`n" + "user_pref(`"mail.identity.$account_id.htmlSigFormat`", $($ashtml.IsPresent.ToString().ToLower()));")  
        }
        # replace signature
        $prefs = $prefs -replace "(?<=`"mail.identity.$account_id.htmlSigText`",\s*`")([^`"]*)",$sig  
        # write back prefs
        $prefs | sc "$tbprofile\prefs.js"  
    }else{
        throw "Identity not found"  
    }
}

# set signature from specific account
Set-ThunderbirdSignature -email 'user@domain.tld' -signature "Hallo das ist ein Test`r`nmit einem Zeilenumbruch"  

# set signature of default account
Set-ThunderbirdSignature -default -signature "Hallo das ist ein Test`r`nmit einem Zeilenumbruch"  

# get signature of default account as html
Set-ThunderbirdSignature -default -signature "<strong>Hallo das ist ein Test</strong>" -ashtml