为什么闪亮的默认应用程序会导致 javascript 错误和警告？

Question

在 Firefox 中运行 RStudion（Old Faithful Geyser Data）的默认闪亮应用程序时，控制台中显示了几个 JavaScript 错误和警告，而应用程序本身运行正常。为什么会出现？

在线访问 Shiny-apps 时也会出现同样的错误，例如https://shiny.rstudio.com/gallery/lego-set.html

背景：我遇到了一个缓慢的应用程序的问题，并希望确保设置一切正常。由于在我检查的所有应用程序的控制台中都显示了 JavaScript 错误和警告（而应用程序本身运行良好），我想确保这些不会导致性能问题。

这是 Firefox 控制台的输出：

undefined pageModifier.js:585:9
Mutations-Ereignisse sollten nicht mehr verwendet werden. Verwenden Sie MutationObserver stattdessen. pageModifier.js:81:20
[Exception... "Favicon at "http://127.0.0.1:4399/favicon.ico" failed to load: Not Found."  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource:///modules/FaviconLoader.jsm :: onStopRequest :: line 186"  data: no]
unreachable code after return statement ExtensionContent.jsm:513:8
Unchecked lastError value: Error: Script '<anonymous code>' result is non-structured-clonable data background.js:273
unreachable code after return statement ExtensionContent.jsm:517:8
Unchecked lastError value: Error: Script '<anonymous code>' result is non-structured-clonable data background.js:273
unreachable code after return statement ExtensionContent.jsm:515:8
Unchecked lastError value: Error: Script '<anonymous code>' result is non-structured-clonable data background.js:273
unreachable code after return statement ExtensionContent.jsm:513:8
Unchecked lastError value: Error: Script '<anonymous code>' result is non-structured-clonable data background.js:273
unreachable code after return statement ExtensionContent.jsm:517:8
Unchecked lastError value: Error: Script '<anonymous code>' result is non-structured-clonable data background.js:273
unreachable code after return statement ExtensionContent.jsm:515:8
Unchecked lastError value: Error: Script '<anonymous code>' result is non-structured-clonable data background.js:273

我在 Windows 7、R 版本 3.3.3 (2017-03-06)、闪亮的 1.2.0 和 RStudio 版本 1.0.136 上使用 Firefox 65。

这是应用程序（未更改的新闪亮应用程序）：

#
# This is a Shiny web application. You can run the application by clicking
# the 'Run App' button above.
#
# Find out more about building applications with Shiny here:
#
#    http://shiny.rstudio.com/
#

library(shiny)

# Define UI for application that draws a histogram
ui <- fluidPage(

   # Application title
   titlePanel("Old Faithful Geyser Data"),

   # Sidebar with a slider input for number of bins 
   sidebarLayout(
      sidebarPanel(
         sliderInput("bins",
                     "Number of bins:",
                     min = 1,
                     max = 50,
                     value = 30)
      ),

      # Show a plot of the generated distribution
      mainPanel(
         plotOutput("distPlot")
      )
   )
)

# Define server logic required to draw a histogram
server <- function(input, output) {

   output$distPlot <- renderPlot({
      # generate bins based on input$bins from ui.R
      x    <- faithful[, 2] 
      bins <- seq(min(x), max(x), length.out = input$bins + 1)

      # draw the histogram with the specified number of bins
      hist(x, breaks = bins, col = 'darkgray', border = 'white')
   })
}

# Run the application 
shinyApp(ui = ui, server = server)

Answer 1

由于 Firefox-Addon "Citavi Picker, Version 2017.12.21" 而发生错误。禁用这个插件，错误就消失了。

让我们看看their support 怎么说...