4 files changed, 6 insertions, 6 deletions
diff --git a/ui/app/conversion-util.js b/ui/app/conversion-util.js
index a7a226cc5..38f5f1c50 100644
--- a/ui/app/conversion-util.js
+++ b/ui/app/conversion-util.js
@@ -46,7 +46,7 @@ const decToBigNumberViaString = n => R.pipe(String, toBigNumber['dec'])
 // Setter Maps
 const toBigNumber = {
   hex: n => new BigNumber(stripHexPrefix(n), 16),
-  dec: n => new BigNumber(n, 10),
+  dec: n => new BigNumber(String(n), 10),
   BN: n => new BigNumber(n.toString(16), 16),
 }
 const toNormalizedDenomination = {
@@ -154,7 +154,7 @@ const subtractCurrencies = (a, b, options = {}) => {
     bBase,
     ...conversionOptions
   } = options
-  const value = (new BigNumber(a, aBase)).minus(b, bBase)
+  const value = (new BigNumber(String(a), aBase)).minus(b, bBase)
 
   return converter({
     value,
diff --git a/ui/app/helpers/confirm-transaction/util.js b/ui/app/helpers/confirm-transaction/util.js
index a37778c19..76e80a8ac 100644
--- a/ui/app/helpers/confirm-transaction/util.js
+++ b/ui/app/helpers/confirm-transaction/util.js
@@ -141,7 +141,7 @@ export function hasUnconfirmedTransactions (state) {
 
 export function roundExponential (value) {
   const PRECISION = 4
-  const bigNumberValue = new BigNumber(value)
+  const bigNumberValue = new BigNumber(String(value))
 
   // In JS, numbers with exponentials greater than 20 get displayed as an exponential.
   return bigNumberValue.e > 20 ? Number(bigNumberValue.toPrecision(PRECISION)) : value
diff --git a/ui/app/token-util.js b/ui/app/token-util.js
index 0d4233766..8798ed266 100644
--- a/ui/app/token-util.js
+++ b/ui/app/token-util.js
@@ -44,7 +44,7 @@ async function getSymbolAndDecimals (tokenAddress, existingTokens = []) {
 
 function calcTokenAmount (value, decimals) {
   const multiplier = Math.pow(10, Number(decimals || 0))
-  return new BigNumber(value).div(multiplier).toNumber()
+  return new BigNumber(String(value)).div(multiplier).toNumber()
 }
 
 
diff --git a/ui/app/util.js b/ui/app/util.js
index 8b194e0c7..ade4fec8a 100644
--- a/ui/app/util.js
+++ b/ui/app/util.js
@@ -271,9 +271,9 @@ function getContractAtAddress (tokenAddress) {
   return global.eth.contract(abi).at(tokenAddress)
 }
 
-function exportAsFile (filename, data) {
+function exportAsFile (filename, data, type = 'text/csv') {
   // source: https://stackoverflow.com/a/33542499 by Ludovic Feltz
-  const blob = new Blob([data], {type: 'text/csv'})
+  const blob = new Blob([data], {type})
   if (window.navigator.msSaveOrOpenBlob) {
     window.navigator.msSaveBlob(blob, filename)
   } else {