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Message preview pane background

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I would like to set a "default" background_image for the message preview pane when no message is displayed. Currently, the background_color I selected is displayed only if a message is selected (Oddly, this color is also displayed on other panes like Settings). A white background is displayed when no message is selected. Google search results usually include some config variable that does not appear in the list under config editor (deleted or deprecated?). Any ideas would be appreciated.

I would like to set a "default" background_image for the message preview pane when no message is displayed. Currently, the background_color I selected is displayed only if a message is selected (Oddly, this color is also displayed on other panes like Settings). A white background is displayed when no message is selected. Google search results usually include some config variable that does not appear in the list under config editor (deleted or deprecated?). Any ideas would be appreciated.

Ọ̀nà àbáyọ tí a yàn

To set a background image for the message pane when no message is selected, add this to userChrome.css:

#messagePane {
background-image: url("file:///C:/Users/username/folder/imagename.jpg") !important;}


To set a background image for the message pane when a message is opened (and also the Settings tab), there is similar code for userContent.css:

https://support.mozilla.org/en-US/questions/1441091#answer-1639485

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Ọ̀nà àbáyọ Tí a Yàn

To set a background image for the message pane when no message is selected, add this to userChrome.css:

#messagePane {
background-image: url("file:///C:/Users/username/folder/imagename.jpg") !important;}


To set a background image for the message pane when a message is opened (and also the Settings tab), there is similar code for userContent.css:

https://support.mozilla.org/en-US/questions/1441091#answer-1639485